Hey Greta!!
Though I haven’t had a lot of experience removing wallpaper, I’ve always done it manually — with some solvents and my own two DIY-ing hands!! If you’re going to pursue a machine, I would read reviews very carefully before spending the time and money!!
As far as remover sprays and solvents, DIF is really great! You can get it online, or at local stores like Home Depot or Walmart!
I hope this helps!
XOXO,
Kate