WoS is a non-custodial wallet, which is different from a custodial wallet such as cash app or strike. So in a way this would be self custody. This is good for smaller amounts of bitcoin. For instance I keep around 1 million satoshis on my non custodial wallet and then when I get over that amount I move it to a cold storage wallet (cold card, jade, ledger). These are both self custody because only you have the keys to these wallets, where as with cash app or strike they are holding the bitcoin for you. This dude has fantastic tutorials. I know it is daunting at first, but just start by moving your sats to a WoS and go from there. This is how self custody starts. Please feel free to DM if you have any questions!