When I first started,and I'm still a PPL student,just,the instructor took the controls from me and told me I was holding the yoke like it was a cobra about to strike me.
My palms sweated so much I bought a pair of light suede horse riding gloves, at £6 a lot cheaper than the flying ones!
I still wear them although I probably don't need them now, but they have become a bit of my "flying kit".
Lister