I've been slowly accumulating Bitcoin over the past year, and now that my holdings are becoming more substantial, I'm getting genuinely nervous about security. I currently keep everything on an exchange, but I know that's not ideal long-term. The problem is, I find the whole concept of self-custody with wallets and private keys pretty intimidating. Does anyone have a reliable, step-by-step guide on how to properly secure and manage a Bitcoin portfolio for the average person who isn't super technical?