As you do the tighten-loosen-tighten-loosen-tighten procedure, leave the wrench on the fitting and pay attention to where the wrench stops at the end of each successive tightening. The wrench should progress a little further each time in a clockwise manner.
This will help give you a "feel" of how much pressure you are applying. Once the tightening movement does not go past the previous one, you are done.
This is a must-do with stainless steel lines.
