Dear hopeless ;or anyone.
To successfully hang up paper without getting bubbles, simply size up (apply wall paper paste to walls) to area where you are working, obviously bubbles will appear but once you have placed wall paper (already sized up too) onto wall then using outward brush strokes from middle of paper this will get rid of any potential bubbles. If bubbles are still present, find a pin /use small knife and put small hole into wall paper this expels air pockets that are often hard to get rid off but DO NOT RIP OR CUT TOO MUCH into the paper as you may find it hard to match up the offending hole. Hence a pin is often useful continue using brush strokes to lose air pockets. also check that wall paper paste is mixed thoroughly too as this can cause air pockets too.
Anthony Tovey, September 2010