Just like I don't need a mechanic to change my oil for me.
I am perfectly capable to do it myself. I just choose not to spend a Saturday under my car bashing knuckles and getting covered in grease because I know a guy who does this stuff every day. He has all the right tools and is very good at it.
Once you decide to hand over the keys, just give me a call. I have the time, the tools and the knowhow to handle your design job.