GHT.
Join the club mate. I can be an absolute duffer with computer problems. Despite having a qualification in 3D modelling. I just used to phone up our computer guy and he would quickly sort it out.
We used A0 HP lazer printer. Which cost loads of money.
I sent a A0 sized drawing as X ref file. The firm at the other end tried to print it A4 and ended up with a colourful smudge.
Bob.