Anyone replaced AF in lens?

[Tulsa]

Anyone done this? or should it be left to the pros at a shop? I am a DIY guy and love to fix things cheap if possible. Might get a Canon 28-70 USM lens but the AF is broke, I dont think its worth more than $20 AS-IS, curious what I could expect to spend to get it fixed by a shop, if its something I cannot do myself.