I just submitted my first one! It was my third appointment this year but the first two times my hemoglobin was just slightly too low. Weirdly, this time the girl suggested I run my hands under warm water before she tried a different finger, and that worked. Everyone there thought it was...
Ohh I can do this! I've been donating blood once a year at Dragon Con, but since it got canceled last year I donated locally instead. And then I just kinda...kept doing it, every time they reminded me.