I typically use lead-free solder unless I'm dealing with some annoyingly massive thermal mass like a joystick anchor, but I use the same rule whenever I'm deali

I typically use lead-free solder unless I'm dealing with some annoyingly massive thermal mass like a joystick anchor, but I use the same rule whenever I'm dealing with solder, fishing weights, and ammo: wash hands before they go near my face after handling lead products. Inorganic lead is not readily absorbed through the skin (that's not to say it cannot be, or never is), so generally speaking as long as you avoid ingesting it (hence wash hands after handling it) there's little to worry about.