I didn't read through all of the comments, so I apologize if this has already been suggested. Yes, I agree, five is way too much. My ideal is 2 a week with a few independent rides. I am in the same boat as an adult rider - my goals are husbandry, confidence, knowledge, no bad habits, ENJOYMENT. I do it for me, as do you. That being said, have you considered groundwork lessons? Husbandry lessons? Not all riding lessons. I asked my trainer and she was all for it. One day we spent over an hour on proper saddle and tack fitting. I learned so much! Same thing with groundwork and general barn stuff. Husbandry is big for me. Learning about illness, health, lameness, what to look for, etc. It all has added so much to my overall "horse" confidence. Five riding lessons a week would be a huge burnout, but whenever I can afford and schedule more than 2 lessons a week, I almost always ask for something like that. Good luck!