There's no reason you can't do one wheel off ground at a time.
Just make sure you get fresh fluid through to each caliper, if wanting better feel use braided lines, and you can also take off the anti rattle shims, I always do, but compound/make dependant could lead to noises, I use yellowstuff with anti rattle backing removed from rear of pads and never heard a sound in 3 years.
Some pads have a very dead feel to them, even if they work well, I found this with the DS range and so now use only ebc as all have feel which is how I like it.
As regards the order, I just do whichever one is easiest and never follow and order, and never have a problem, so long as enough run out to get new fluid at each wheel will be fine.
tabetha