Nothing really scares if you don't buil castles in the air. TBH, Self custody of my Bitcoin scared me initially. But as the time passes, I always followed a simple rule of 'Not putting all eggs in one basket'. I use both hardware and mobile wallets for self custody. Even I don't mind holding a little bit (upto 10% of my all Bitcoin) on a CEx. Yes, it absolutely brings another headache of managing passkeys etc. But for that I do have a secret diary...