just go dude.
I had instructor for 5 hours for start, how it works, fly kite, safety, body drag etc. And then 2-3 hours for more safety and waterstart, but wind was extremely weak- he gave me to fly 19m kite that day it barely counts. After I could go up on my strong side and crash after 5 meters instructor say I could go crashing and progress without him
In general, instructor after that only can give you tips how to correct small mistakes, but can't save you from failing. It is about hours on the water and getting better. Self rescue? You would not do it now- you will be doing walk of shame close to the shore anyway.
I remember how it felt- going without instructor- very insecure, but just fly kite a bit, and you'll remember what you were taught. Do no kitesurf alone on the beach. Also find wide space, you'll fail- do no hurt other people. And if you put on helmet- everyone on the beach will know you are new- will keep good distance from you I used helmet a lot Impact vest with some flotation also nice to have.
Have fun!