Patience, Grasshopper.
OK, seriously, you can make ANYTHING by hand that you can make on a machine. However, handwork often demands better, more uniform material to start with. Hand planing and scraping works best with the best wood. Less uniform wood can be power planed.....with some success, and the least uniform wood is best power sanded. Some fellows use only the best wood. Myself, I take pride in making bows out of some real strange stuff, and by "listening" to what the wood demands, still ending up with a bow that works. What that means is that a blue-print design, even if made by a world famous bowyer may not work on ANY INDIVIDUAL STICK.
Either way.....patience is the answer, and if using nothing but hand tools, then the first tool you need is a large chunk of time.
piper