Wallpaper can be very easy, or quite a pain. I've done it four times now. At first I thought it was horrible, but that is when I tried the scoring tools and the steamers.
In most cases, it shouldn't take too long. The biggest key is to get through the paper to the glue behind it. Those scoring tools make little holes, but those tools are very slow and almost useless. Same with steamers, they just can't get the water through the top wallpaper layer. Instead, you can often just grab a pealing corner or edge and pull. A
6" drywall knife helps to pull it off. You'll probably get the whole top layer off in a few minutes (with a few pieces stuck randomly but ignore them). Then you'll be left with lots of residue. That residue needs to be wettened. A sponge and a bucket of water is all you need. I tend to get the sponge almost soaking, then wipe in on until the sponge is dry. Take the drywall knife and scrape gently along the wettened part of the wall (don't jab it into the wall) and the residue will fall right off. Whole room done in a couple of hours with tools you probably already have.
Only if that trick fails, then you'd want to try something like a scorer or a steamer. But in that case, I'd just hire it done because you were the unlucky type and it'll be a real pain to do.
The real problem is what may be underneath that wallpaper. Holes, more paper, etc. Be sure to wipe it down when you are done (plain water is ok, but try using a bit of TSP which is a common soap for that).