Now you need to trust developers who wrote the client code, trust large mining(/staking whatever) pools not to collude and 51% you, and uhhhh trust yourself to not lose the fucking keys, or to be an expert in all the various "protection" schemes like multi-signature wallets (until they explode because there's a bug in them)… You also have to 100% trust yourself to not get scammed — there's no chargeback if you do.