Can a Windows tech do basic OS work?

I have an issue I've asked about and researched and am unable to solve after trying several suggestions. I'm at the point where instead of doing things I don't fully understand (tech nOOb) I'd rather just have a tech help me out. I live in Peru, South America, where Apple/Mac is a tiny minority. My wife's families computer guy is PC/Windows. He's helped me in the past with configuring my iPad when I had problems. The culture is such where if you ask someone for directions, they won't say "sorry, I can't help you," they'll instead give you made up directions. Don't want to risk this by asking someone to help me with OS X if they only know Windows, but since my problems are fairly basic (iTunes doesn't want to find my library after I copied to another Ext. HD) I'm hoping that the two operating systems are close enough that organizing/cleaning up some files/folders/paths would be simple enough for our family friend to handle. Just thought I'd ask as I don't want to create problems for myself. There is a store that specializes in fixing Macs but I'd rather leave my laptop, Time Capsule, and Ext. HD there if I can have someone I know and trust handle this.