Focus on where you are on the table. If you are early to act a 4 bet may be a good strategy. If you are later to act. If others limp in, you may want to limp and see if you hit the set. If you don't hit best option is to fold. If everyone ahead folds, a bigger bet may be the option you want to take. A K or Q are a big red flag. only call a limp to get one more shot at trips.