It's not a difficult drive, at all.
I'e done the tour at Vannulo and recommend; check to see times for the English=language tour. They have a nice cafe where you can have bufala-milk yogurt, ice cream, etc--and you can also buy cheeses.
https://www.fodors.com/community/europe/my-visit-to-the-tenuta-vannulo-water-buffalo-farm-near-paestum-947662/
But there are also other cheese makers that you can visit without a fee, if you have a car. To watch the process of cheese making, it's usually better to go early in the morning. If you have more than a day there, just stop by any cheese maker you come across and ask if you can watch them making the cheeses the following day, and ask what time you should be there. IF they allow this, It's good to buy some cheeses from them.
In addition to Vannulo, I watched the process at this shop, and bought cheeses to keep in the mini bar.
Masseria Lupata, via Porta Marina, Paestum. Phone: 0828.722.002.