Personally I;
1. wrap 3-4 times around the rim with electrical tape
2. Fit tyre and tube and pump till bead pops
3. Pop off one side of the bead and replace tube with valve
4. Shake sealant and add a few Mls. and pop tyre back on
5. Pump like hell until bead pops
6. Shake tyre
My method had worked with every tyre and rim combination I’ve ever tried, from fat bikes to XC race bikes. I’ve never had any issues.
If you get a puncture, keep riding. The sealant should plug the hole. If it’s too larger hole then you can buy tubeless worms to help plug it. If all else fails then fit a tube.