I'll add some YT links as I find em, it never hurts to add to the ref library.  Don't worry about jacking up, that's a given.  Just try not to get flustered over it.  Remember, oven cleaner is your friend.  If you mess up, zap it and scrub it, start over. 

You can PM me if you've got specific questions.  Check the YT link below.

https://www.youtube.com/@SmallSoldier  He's got a few feathering techniques that work wonders, try em.