A piano must be very close to standard pitch (A440) before a fine tuning can be done. When the pitch level of a piano is changed by more than 3 or 4 cents (there are 100 cents in a half step), the change in tension causes tuning instability. As the pitch level is changed, the strings that are adjusted early in the tuning will change as subsequent strings are adjusted. So, when the pitch level of a piano is very far off from standard pitch (A440), a quick rough tuning is necessary before a stable fine tuning can be done. This rough tuning is sometimes called a pitch raise or a pitch correction.
When a piano is significantly off from standard pitch (more than 25 cents flat or sharp), more than one rough tuning is necessary to provide a tuning exactly at standard pitch. I can help you decide, based on how you will be using the piano, if multiple rough tunings are necessary. Your piano should be maintained close to standard pitch. It was designed with standard pitch in mind, and it will sound its best at standard pitch. However, if your piano needs a significant pitch correction, it may make sense to make the correction over the course of a couple of regular tunings.