Congratulations on your first series of practice shaves.

It sounds like your blade angle needs some adjustment. Try shaving at a 15-30 degree angle with your razor. Don't force the razor. Let the razor and a gentle scything motion cut your whiskers.

BTW...An occasional tough spot on your beard is quite normal. When you hit a spot like that, back off of it. You can always get it when you touch up after shaving the rest of your face.

Take care--and smooth shaving.