buy one of those oregon powersharp kits. you snap it on the end of the chainsaw, press it against something, and run it for a bit and it sharpens the chain for you. i wouldn't sharpen a chain by hand. i think it's like $40-$50 for the oregon kit. it includes a bar, chain, and sharpener. make sure the chainsaw you buy has an oregon kit to fit it. they don't make the kits for every chainsaw.