+1 on weedy's advice. I did not want to to major operations on high dollar equiptment that I relied on and and did not want to 'practice' on them. I was always dropping off green waste at my local tip and would often see trimmers/saws left to one side that people were throwing out. I would bring them home and fix them. I bought a basic Wiha 10pce chainsaw tool set, case splitter, compression gauge, threebond, roll of starter rope & a few meters of tygon fuel line in various sizes. Those tools alone helped me bring back to life many saws, trimmers etc. Now I have a heap of more specific saw tools but what I still use most is out of a $60 Wiha chainsaw kit. Practice on things that don't matter untill you get the confidence and knowledge to do what you want. Even now what may take someone like Randy one hour, takes me three but I ain't in a rush and it don't put food on my table.