Where can I get professional to refurbish 2 PowerBooks?

I have two 17” Aluminum PowerBooks. Both have dead batteries and power supplies (the one that looks like a UFO), but otherwise were functioning fine when they went dark. One belonged to my husband, one to me. I am not sure which is which. I don’t feel confident about making the repairs. And I don’t want to make a costly mistake in diagnosing the problems (we’re on SSA). I used to write about computing, but only big systems administration so hands-on was handled by my husband, who is now very ill, can’t do any of that and requires 24/7 care, which I provide. But I loved that computer. It has all my favorite applications on it, no longer supported or even accessible by MacOS. And both have irreplaceable data on them. Does anyone know where can I get professional to revive at least one and retrieve the data from both? Local Mac repair shops don’t work on these.