Originally Posted by
Kapusta
“dry run”
Military parlance...meaning do a full speed rehearsal without live ammo. In this case, mount the tire fully, WITHOUT sealant.
Once the beads are set (and if you need soapy water, use it to achieve this), release all the air, remove the valve core, and inject sealant in the desired amount, reinflate, shake/rattle/roll/ride to get tire sealed.