You can certainly do it yourself as with most things but not paying is really still not going to be an option as you will have to have a compressor and a pot and depending on the scale hoses Fresh Air hood charcoal filter Etc. The main problem with doing it yourself is that the equipment that you will likely have will limit you in air pressure and volume to the point where it’s really just not a practical idea or practice. Now if you have just a very small piece with a little paint or just rusty then there are small hand-held blasting guns or small low-volume blasting pots that will get the job done. If you do decide to do it yourself just make sure to take all of the safety precautions because sand contains free silica and breathing it over an extended. Of time the dust anyway can cause silicosis a very horrible lung disease to have to deal with. So don’t jeopardize your health 2 save a few dollars especially if it’s not going to save you much money at all anyway. That is what my self and others do this for to accept the risk of the hazards for you.