It’s not impossible for a homeowner to perform bathtub refinishing, countertop resurfacing, or tile reglazing. However, professional refinishers are trained, and underwent months of practice, to be consistently, successful. To perform bathtub reglazing, or refinishing any surface, yourself, you need to train, find the proper chemicals and coatings, learn spray techniques, rent or buy the proper equipment, and qualify to access hazardous situations. Remember, if you’re unhappy with your own work, a professional refinisher will have to remove your work and start from scratch. In the long run this will cost you much more.