Hi Kristie, I would suggest that you let Louis have a go if he's keen - we delayed with George mainly because we just couldn't stand the mess, and it took him a long time to learn how to feed himself. Whereas with Milly, we have let her set the pace, and at 14 months she can eat almost as well as he can at 3.
If you're worried that he won't actually get enough in by himself, you could either use several spoons, shovelling some food into his mouth between his attempts, or you could alternate spoon food with finger food, so that every second meal will get in reliably.