Linux Mint has a full install guide that goes into detail on every point with the click-through links. They are a real good source for people who haven't done this before.

My suggestion to people is to install Linux on a computer you don't use every day (old laptop, etc) and during installation have it be the only OS (ie, not dual boot with Windows). After awhile when you feel more comfortable, install it on your main machine. This lets you learn at whatever pace you desire.