As Matthew stated, check the rim for rust and small dents. The dents can be removed with the applicable of a well place ball peen hammer blow. If you do have some rust use a wire wheel on a small hand grinder and then repaint. Usually you will clean the rims quite well.
On the other hand depending on the price to sandblast the rims it might be well worth it to leave it to the professionals. You can spend days cleaning the rims. Your choice, me I would let them do it, the rims will look like new. Also if you plan on buying a tire changer ask yourself; How many tires will I change and when will the machine pay for itself. I pay $16.00 to change a tire at the local tire place, if you spend $1000 for the used, condition unknown machine you need to change at least 62 tires to break even. Also don't forget these tire machines work on air and you need a decent size compressor. To save some money on tire changes look to buying air stem valves from NAPA and bring them to the tire place, the valves will cost you 1/2 the price. Gilles
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