Some tire and rim combinations are tougher than others, require better quality tire levers. The most tire levers I have ever needed was three, that is why some tire levers have a hook that can hook onto a spoke to hold the lever in place when you only have two hands.
I do not know if you are new to putting tires on rims or not, but if you are new to it, it can be critical on some tires to get the tire bead in the middle of the rim on the part of the tire that already is on the rim, that way the bead sits in the depression in the middle of the rim.
For example, this is a Dyad cross section. You can see that the tire will be looser on the rim when the bead is in the middle of the rim.
On those tighter tires, be careful that you do not pinch the tube, you can puncture a tube if you pinch the tube too much with a lever.
If you are new to this, you may find that a dirty tire causes dirty hands, which eventually makes everything else dirty too. Thus, if you have any disposable medical type gloves, it can be convenient to pack a pair with your spare tube.