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CYOA-
I hope you find it useful, they are all things that I've got wrong in the past! Some more than once :(
One of the biggest problems is cutting wet paper, you should find everything else goes fairly easily but tearing instead of cutting a piece of pattern wallpaper will annoy you for a long time. I always like to have a bit of spare material, that way if you do mess up a drop you don't feel under pressure and you can still go about the rest of the job with a cool head.
Airhead
I don't get much call for pattern wallpaper, not sure why really but I do a fair bit of lining paper. If you're taking it on in bits then you'd want to do whole walls at a time, get them nicely finished and then move on to the next part. You probably wouldn't suffer to much if you didn't get a whole wall done.
There's a strip of thin plastic you can buy that you put under the wallpaper where you want you make a join at a corner, you overlap the wallpaper and then cut through both layers with the plastic strip underneath. You can't just go round most corners with a full sheet as the wall is not exactly a right angle all the way down and the wallpaper will crease or end up out of line. So just 15-20mm round the corner and splice it.
Read the instructions on the paste, you need to prime the wall before you paste it, if you have filler on the wall use a sponge to feather the filler. Get all your filler sorted before you open the wallpaper and clean the skirtings, anything that gets behind the paper slows you down and messes with the glue.
Don't let the paste get too dry when you hang the paper, especially at the joints. There's a plastic wallpaper smoother available for a few quid which does a great job, you'll also need a snap off blade knife, a small olfa one will do, snap the blade off nearly every cut or you'll screw up the edges. That is really important, never touch the paper with a blade that can't cut it cleanly.
Don't panic if you get a few bubbles, they develop about 1/2 an hour after you've smoothed it and they settle down after a few hours, don't try dealing with them while you are papering the wall, likely they won't show the next day anyway. You'll probably get some joints that don't stick, deal with them the next day, you can use a syringe to put a bit of glue in them, sponge then wipe off the excess.
If you're doing stairs you need a decent stair ladder as you have to get right up to the wall/ceiling join. You can't do this balancing on the bannister.
Use a decent sponge and lots of clean water to take of the excess glue, check that the print doesn't react with the glue and wiping the surface when it's wet etc. Some prints are not fixed that well or the surface will show dried glue if you don't wipe it completely.
Like I said, you're in at the deep end. Prepare properly and it's a quick job, rush the prep and its a disaster waiting to happen. Try the small areas first obviously.
Forgot to mention, use a laser level or plumb bob to get your first upright, don't rely on the corner of the wall.