Usually a fitting is time blocked so most will be either driver/fairways or a separate one for irons. You may be able to squeeze in both if quickly dialed in. The fittings usually start with creating a baseline with your existing club and then trying new models with different combinations. They will not have in-shop equipment to test your lofts and lies on existing irons. You can have that done in any good golf repair shop. They can have you hit a 7 iron with 2 degrees flat or another head with 2 degrees upright to determine if that is what you need based on TrackMan results. Enjoy the fitting and from there, you should get a good idea of what, if anything, you might need to change.