You would want to drip acclimate him, or at least slowly add a little bit of your tank water every little bit of time to equalize the tank water to your snail and what he's used to so the pH/water parameters don't shock his system.
Being shipped I doubt he will come in very much water, try to think in proportion to the water quantity he comes in like maybe 2 oz of water comes with him maybe add 1/4 tsp every half hour until volume has doubled.
You also can do a quick test on the snails water and see how close it is to your own and if there is only a small difference then it may not need to take as long. As you won't have as far to meet both water parameters.
When you get the water equalized, then float for a bit for temperature evenness, then put him into his new home.
Here is one of my favorite pics of red pearl Ramshorn.
Heres a fun one where the pond snail is hitch hiking on the golden Apple snail!
This is what the Apple snails eggs look like if they lay them. Mine should hatch sometime this week if all goes well!
Snails are a lot of fun. I have a Nerite too, awesome cleaner. She leaves some eggs, they don't bother me much. If I find some nice shelled Horned Nerites I will be bringing them home!