i have been playing tennis for a while but ever since i have been playing at the college level i have been breaking strings a lot more than i used too. I hate having to shell out 20-30 per string job and hate letting anyone else touch my rackets. Do you think it is a good investment to get a stringing machine? If so what would be a good cheap one to buy?? also is it hard to learn to string a racket?? i have never done it before. Thanks!