> I've been playing guitar on and off for 30 years. I'm holding the pick completely wrong and it hugely negatively impacts my playing - but I've struggled to correct it (I hold it with thumb, index and middle finger; if I try to hold it with just two fingers, it inevitably slides out after a few strums; I don't know how people do it).
Try orienting the pick slightly so that when you strum the strings, it plucks the string with the leading edge, rather than with the flat side of the pick, so you don't need to press as hard.
> I've also been trying to snap my fingers wrong for 20 years until somebody finally explained to me that it wasn't my fingers rubbing / clicking / pouncing against each other that made the sound, it was the finger snapping/clapping on the meaty part of your wrist. Doh!
I've found snapping to be louder and fuller sounding if I don't use my thumb to "tension" the middle finger at all, but instead just smack the the middle finger against the "meaty part". Plus you can get a lot more snaps done in much less time if snaps-per-minute is an important metric.