There a definite pro sides and con sides. The knowledge is invaluable, both lessons, and having other horses to care for. The help fixing up the place would be awesome too, and hopefully it would get done faster as well. As for finding someone to care for them if you go out of town, I know that there are several people in my area that will feed, clean, and water your horses for a reasonable fee if you were going on vacation. Its not the same thing as having someone on the property watching them all night long, or all day long, but at least they would be getting fed. What about the horse's owners, maybe they could step in and feed if you needed to be gone. It takes time and effort to care for horses on your property, but if you think that you would be able to take care of the horses, ride, and still have time for school work, and friends, then I would seriously consider it, draw up a draft of a contract, hours of the place, so you don't have owners or potential buyers, or whatever coming on your property at all hours of the day and night, what they can use, and where, ect ect, and see what all the parties involved think.