Retin-A Effectiveness While Shaving and Is it Okay To Combine Retin-A and Facials?

Hi. I'm 42 years old/male and started using Retin-A a week ago. I don't have any major problems with it, only a bit of flaking and redness which doesn't really bother me. My question is: will shaving daily (or almost daily) have an adverse effect on my skin or reduce the effectiveness of the product? Secondly, I get monthly facials; do I need to stop using Retin-A a few days before I get my facial and how soon after the facial can I resume using the product? Thank you.