If you’re patient and thoughtful, you can learn how to level the frets on a guitar. But remember that the people who find this job the easiest are usually people who already had skills with hand tools. Even with skills, your first fret level will not be as good as your tenth one. No one does their first fret job without leaving room for improvement.
Finally, I can’t agree that every guitar that’s not high-end will benefit from a fret level. In fact, before you try your hand at fret leveling, it’s a good idea to learn how to measure how far out of level it is. Then you can decide whether a leveling job is worth the permanent loss of fret height that leveling causes, and you’ll have an idea of how much fret height you’ll lose. You’ll also have the ability to measure just how level you got those frets.
Oh, and if you’re leveling a guitar with a set-in neck, don’t forget to remove the pickup rings, lower the pickups, and protect the body from that nasty leveling beam.