Man, I'm a crappy music learner. Always just played by ear - I tried piano classes in high school but when the teacher left the room I would fold up the music and play what I had heard. Same with guitar and then bass, using tab to find out the tricky bits. So I can play many things... in their original arrangements at least. A few things from the 90s in Eb I just play in E because detuning is a pain for like one song, heh. Transposing is difficult for me.
I can technically read music, but it takes me like a half hour to read each line of sheet - I have to sit and do each note one at a time - and then a few extra minutes to go back and flat or sharp all the notes according to the key signature. It's like reading a foreign language you took one year of in junior high... I have a similar problem with the fretboard, though - beyond the gimme positions like 1-7 and 12, I have to sit and think what note I'm on.
I say all that to say this: Fretboard note-name stickers would sort of only help me if the note names were written on whatever music I was reading from (sheet, tab, whatever), because I just lack that fundamental direct translation between the staff and the fretboard. And if somebody needs the stickers, then that probably means they know the music, just not the instrument, so they're halfway home! =0)
I really do need a good music theory instructor. I've been playing for decades and couldn't even tell you what key 99% of what I play is in, or even what a I-IV-V would be for a given root (without a good hard think).