In my opinion, it is really not that difficult to hang vintage wallpaper...it just takes a little more time and patience. It's definitely worth it all too, because when finished, you will be rewarded with a look like no other!
Tools of the trade are wheat paste, a large sponge, a straight edge ruler, and a roller cutter. I highly recommend that you use wheat paste, just like they had back in the day, and if you cannot find it locally, I order mine online. After mixing with water, wheat paste can sometimes be lumpy. On this day, mine turned out extremely lumpy and after much mixing on my part I finally gave up, and used an old strainer to push the paste through. Voila! lumps removed. I then like to apply the wheat paste directly to the wall to be papered and allow it to dry for a couple of hours. This gives the paper a little something extra to grip to when applied to the wall, kind of like sizing.
I also recommend that you use a straight edge and a roller cutter to trim the wallpaper. If you try to use a box cutter-type knife on wet paper it will rag up and you will have a real mess.
While the wall was drying, I measured, matched the pattern and cut the pieces I would need to cover the wall. I left a little extra on both ends. Then I trimmed one selvedge edge from the paper. There are two schools of thought regarding the selvedge edge: some hangers like to trim both edges and some like to leave one edge and overlap the paper. I prefer the latter just because I think it gives the whole thing a more authentic look.