Just as Felix said, no one is going to be paying close attention to your hands.
Most FTMs do have small hands, and most pass after HRT regardless of that.
Your hands will not change drastically. You will gain weight, and it's possible for them to get somewhat larger due to that, but it won't make them lengthen (if anything they will widen*as in finger thickness and such*, but not drastically). If anything, my bet would possibly be going up in a ring size. I have never been in conversation with another man and looked at his hands to the degree of noticing size(if I looked at his hands, it was most likely because he was gesturing), so I'm not sure what cisgendered mens hands are; small or large, and I can bet the only one noticing your hands will be someone that is in close proximity for some sort of affection(as in that you're touching). That being said, I truly don't think she/he(whichever your preference) would be one the wiser, and while on HRT no one else will be either even if they do notice smaller hands.
Just like feet size, there isn't a lot of difference that HRT is going to make towards that.