Found the easiest way (for me anyway) was to put the tyre on the wheel, squirt soapy water around the bead, take the valve core out, pump like mad (I only have a track pump, no air blast canister/compressor), get the tyre seated (satisfying popping noises), detach pump nozzle, put the sealant in through the valve stem, replace valve core, and pump up, then give the wheels a good spin.
Result is inflated tyre, and no sealant explosion!
Just helps the tyre pop on the bead a bit easier, especially if the tyre/wheel combo is a bit tight.
As you have a compressor, you shouldn't need to bother with soapy water though.
Found the easiest way (for me anyway) was to put the tyre on the wheel, squirt soapy water around the bead, take the valve core out, pump like mad (I only have a track pump, no air blast canister/compressor), get the tyre seated (satisfying popping noises), detach pump nozzle, put the sealant in through the valve stem, replace valve core, and pump up, then give the wheels a good spin.
Result is inflated tyre, and no sealant explosion!