Lessons is a great idea and can't hurt just help make you a better sailor.
I had been sailing sunfish and Hobie's for alot of years but when we bought
our first 29 keel boat my wife made me promise to take a week of sailing lesson's on our new boat.
It was a great idea because we learned how every thing worked on our new Hunter 290 and my wife how to sail and enjoy sailing so much more,we now have a 36 which I single hand all the time it is new and easy to sail but thinking of sending the wife for sailing lesson's again to refresh her sailing skills.
Have fun and lesson's are only the beginning of learning to handling your boat,you need more time out sailing your boat to really get good at it for cruising which is more learning,have fun and enjoy.