Re: Chainsaw sharpening
If you're looking for a general "how to", then I'd suggest YouTube. Don't take everything you see on YouTube as gospel, you've got to be able to determine what will work for you and what won't.
As a general guideline, for a simple dull chain, you take an equal amount of strokes off each tooth. If one side of the chain is duller than the other, you still want to take equal strokes, but it will take you a whole lot more of them to make sure you get an even/straight cut. As you cut each tooth back, you will also have to adjust the hook that is just in front of the tooth, there are a variety of depth gauges available for such things, but, unless you're removing a great amount of material from a tooth, you won't have to mess with the hook very often.
There are a number of sharpening guides and jigs available, but you really can just eyeball the file into the tooth and get a decent sharpening. Every 5 to 10 sharpenings you'll probably want to let a shop do it just to make sure that it's kept at an optimal angle.
I personally just use a round file suitable for the tooth and free-hand it. Mark the top of the first tooth you sharpen with a sharpie marker, this way you know when you've gone all the way around. Do one side first, then do the other side, your accuracy will be much better this way.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!