New to belly inflation

Hello all. 

I am brand new in getting into belly inflation. i've fantasized about it for so long and foond a partner that is willing and wanting to explore it with me. 

Im not sure how to approach this for the first time. 

I did read on a precious forum that you can purchase a manula nlood pressure sleeve and just remove the hose with the bulb and just ise that. 

Also, safety. 

What are slme general rules of thumbs to stay as safe as possible while inflating?

What feelings to look out for?

When to stop?

How to prepare for an inflation session? 

And anything else anyone can think of. 

Thank you!!!