There's a wealth of help available out there if you do decide to try alternative computing and run into trouble. (I have to say that unless you try bleeding-edge software or have esoteric hardware then you shouldn't need a lot of help!)
All the popular distros have their own Help forums, and there are plenty of mailing lists, newsgroups and web pages for applications and distributions as well.
Don't be put off by your lack of knowledge – although you will encounter the odd person who will brusquely tell you just to read the MAN pages (MAN – short for Manual - all distributions have them but they can be quite cryptic and confusing for someone who is new to this), I assure you that they are few and far between. Most people will welcome you to the alternative computing scene and will try to be as helpful as possible.
All you need to do is to make sure that you supply as much information as you can, and stay calm!
Some non-Distro specific help resources: