I've only done one veneering project (pair of monitor speakers), but I spent a lot of time reading various websites about veneering. It seems to be universal that a vacuum setup is the best way to go, but I didn't want to buy/build one for just one pair of monitors, so I took the contact cement route (not the most recommended option, but it worked well for me). I used raw, trimmed veneer, so I had to deal with seaming pieces together. Are you planning on buying a veneer sheet or raw veneer?
You should definitely test whatever technique you use a couple of times on scraps first. This also has the advantage of giving you veneered scraps to test finishes on.