Lasts are the DNA of the shoe. You can do all sorts of things to the skin, and you can dress it up however you want, but noting will have more of an impact on your shoe design than the last. So if you want to make your own, it’s great to have guidance. Believe me, I’ve tried doing it on my own and it’s a schlog. But you may have better luck.
I recently heard about the Lastmaking School up in Snohomish, WA. If you are willing to take a trip to a beautiful part of the country, they have a few classes (starting at $595) from Beginning Lastmaking to Advanced, and some other interesting offerings. They have a full list of classes here.
Having struggled so mightily with last making myself, I can certainly see the value in getting taught by folks who seem to know what they are doing.
If anyone has had experience taking a class with them, let me know.