Buy tools you need from your local bike shop. Prices may be a touch higher, but they will appreciate the business and be more willing to offer advice and even give a few lessons as you go along. I have a few customers that are in the same boat as you and I offer discounts on tools and supplies as well as tips and advice. Investing in the relationship with your LBS is just as important as investing in quality tools. Also, is there a Community bike shop in your area? They would also offer advice and let you use a headset press, and other expensive tools when you need them. Most even offer mechanics classes. Also investing in a copy of Barnetts Manual would be good if you can think methodically and want to learn how to do things right.