You don't even need that much know how! My neighbor saw one of mine, asked a few questions, borrowed a few tools, and a week later he was riding his own! You can DIY, a great ebike for well under 2k, if you just believe in yourself! After all, you have a vast knowledge base here on EBR, everyone here wants to help you get on an ebike. Learn all you can about the kits available, borrow or buy a couple of bike specific tools you need, and you can DIY!
BTW, my neighbor is 69 and we now do a weekly ride on Saturdays of 30 to 50 miles. The total cost of his build, including a very nice new bike, was just a little less than $1700.