Learn when to keep going and when to advise them to go elsewhere for assistance. My advice is to buy and use the best hardware you can afford, with the appropriate productivity and utility software for your particular situation. Keep current with commercial and shareware updaters and upgrades, unless you won't actually benefit from them. Read, read, read print and Internet source material. Establish a rough budget for both your time and your expenditures.
Computers are expensive and very time-consuming.
I welcome your responses, and tales from your personal mouse-travels. I did a little Quicken, got my email, then sent some outgoing mail. When I went to shut down my computer, I was puzzled when it didn't turn off. Nothing like this had ever happened. I tried again.