Fisting Bottom Trainee Recommendations

[PozToxVersPig]

I am upsizing my PA tomorrow meaning my dick will be completely out of commission for 6 weeks or more for healing (I'm banking on more, since I'm doing such a significant jump in sizes).

I have also aspired to be a really good FF bottom.  I can FF top alright, but I've also wanted to work on getting my hole more stretched and flexible.  How it remains so tight after all of these years of taking dick, I  can't explain.

1. Stretching Aids:
   1. The buttplug I'm looking at is the SquarePeg Egg Plug, Medium size to start.  I'm not quite clear how big it is to my current butt plug which is more pyramid shaped with a wide base.  It does come on multiple sites as good for FF training - the hardness of the material + the shape.  Any other recommendations?  [think before following links] https://www.mr-s-leather.com/square-peg-toys-egg-plug?CLRSTAND=1363
   2. I've heared about these rigid cylinders that go by multiple names.  These aren't the ones I originally saw but is something like this advantageous.  Again, the benefit seems to be the hard and rigid material forcing the muscle to stretch more.  [think before following links] https://bound-by-desire.com/products/crystal-3-piece-glass-trainer-kit-clear?collection=anal-gape-toys-anal-training-anal-stretching-anal-dilation
2. What is the right schedule / regimen?  How much and how often each day?  Should I wear the plug all day long (the Square Peg site says they are specifically good for 24 hour wear.  Any thoughts?

Thanks in advance.