I don´t want to scare you. I don´t personally know you, so i can not tell if you are ready for a tuck basket or not. They are not to hard, but you have to know what you are doing: body control, knowing how to start the rotation at the right point etc. And it´s correct that you don´t need a standing tuck to learn a back tuck basket. And i´ve seen girls learn this skills without any knowledge of flipping in tumbling. But i´ve also seen a lot of gone bad tuck baskets.
It seems your coach plays games with safety because she wants to have as much difficulty in the routine as possible. In my opinion, that´s just wrong.
So, i have an advice, more like a tip what you could ask her for, even though i think there are better ways to learn a tuck basket, this would be a little more safe than just "Go for it":
Ask her if you can have two prep bracers on each side so they can assist a little with the rotation. Because if you are scared (and it seems you are), there is a little risk that you won´t go all the way and the bracers will slow you down.
If it´s easy for you, try one bracer so you can focus to ride (and use the free arm to pull up first) the basket before you rotate.
Like i said, not my favorite way to teach flipping baskets, but to tell someone who doesn´t do tucks on tramp or floor with a spot and knows the steps isn´t a safe way (for me). I´d at least expect she will give you really good spotters for your first attempt.
Edit: Your instagram looks good. Don´t know why, i assumed you were an allgirl squad - great pyramids.
Stay safe :cheering: