The slightly different elevation angle between the two satellites is not a problem.
You'll need two standard 40mm neck LNBs - if they are just to feed a single tuner then one single output on each LNB is fine. Otherwise say to allow for a Sky+ or Freesat+ receiver, get at least a twin or better yet quad output (not quattro) LNB at least for the 28E LNB as you'll need at least two feeds for the PVR to properly work. Having some spare outputs also gives some future proofing if you want additional receivers added to your setup.
You'll also need at least 1 Diseqc 1.0 switch - if you are going to be running two feeds from both LNBs for a PVR, then you'll need two such switches. You can get them either in two-way or four-way versions, the cost difference between them isn't that much, I'd use a four-way to help future-proof if you want to add another one or two satellite positions in future e.g. 23.5E or 13E.
You'll also need a bracket that will allow you to aim several LNBs on the one dish. Something like the one below on eBay will work fine (the third holder can be kept as a spare). Depending on the dish bought there may be a special bracket available for multi-lnb attachments, but in my experience with these your mileage may vary.
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Inverto Multi-lnb Holder for All Satellite Dishes Hotbird (holds up to 3 Lnbs) for sale online | eBay
Then there are two ways to align it. One, as suggested by st1, is to aim for a "mid-way" point between the two satellites, 23.5 East is ideal for this, and then offset your two LNBs to each side (this is possible with Triax dishes who have specially produced brackets for multi-lnb use which doesn't rely on an LNB to be at the main focus), though the multi-LNB holder I've linked to above requires one LNB to be at the main focus - this isn't really a problem. My advice would be to aim the dish for 19 East and then use an offset-LNB for 28 East - the new Astra 2E & 2F now give some quite stonking signal levels in the UK - the few signals still left on Astra 2A and Eutelsat 28A at this position will transfer over later this year (likely all will be done once Astra 2G comes into service) but in the meantime you can use the signals from Eutelsat 28A (which is the weakest in 28 East location) to peak your signal at an offset position once you get a sniff of a strong signal from 2E or 2F first.
On a multi-lnb bracket, if you are facing the front of the dish with the 19 East LNB being at the main focus point, the 28 East LNB will lie slightly to the left of the 19 East LNB and will also be slightly higher. How much this difference will be will depend on the size of the dish you use, the bigger the dish the bigger the gap between the two LNBs.
This will depend on where you plan to mount your dish, but if you can view the signal meter on the receiver you plan to use for alignment (even just a temp setup for aligning the dish) this will be a big help. You can use a cheap meter which has a tone & needle to help with alignment but it won't tell you exactly what satellite position you have landed on - one slight headache is that the frequencies used at both satellite positions are near identical (bar the frequencies currently used by Eutelsat 28A at present) so you could quite easily align on 28 East when you want 19E! The trick here is to look for a signal on a frequency on one position that isn't being used on the other (or for that matter, 23.5 East as well). For aligning on to 19 East, 11.186GHz Vertical (TV Trwam) is one you can use as this isn't in use at either 28 or 23.5 East presently. If you align on to 28 East, 10.714 Horizontal (Channel 4) is a good one to use to not only differentiate from 19 & 23.5 East but also to "home in" when aligning an offset LNB as it's quite strong - once you have a good signal from Channel 4 you can then use one of the weaker Eutelsat signals to "peak" your offest-LNB position, 11.222 Horizontal (CBS Action) or 11.261 Horizontal (Vintage TV) are good to use here as from my location they are on the weakest signals currently available at 28 East at my location.
If you've never aligned a satellite dish before then it can seem quite daunting at first as alignment, even at 28 East with it's powerhouse signals, needs to be very accurate compared to say a UHF TV aerial but if you give yourself a little time & patience it shouldn't take too long to get at least the dish fixed on its main position (e.g. 19 East), and one you have that done you can fix & tighten up the dish brackets as adding a second LNB for 28 East doesn't involve having to move the dish.
If you need any more help I'll try if I'm around here or I'm sure the healthy pool of knowledgeable posters here will only be too glad to offer as well.