Here's a link for homeowner's who need to hire someone.

Here's the link, and below is my commentary.

I would like to point out that in California, all jobs over $500 in labor and materials should be performed by a contractor, if you're not going to do it yourself. Though if you follow here guide for payment under painting you may not be left  in the lurch.

Also, I don't think a garbage disposal changeout is beyond most peoples ability. It's time consuming the first time (3 hours), but if you have a newer model (within the last 7-10 years) you can probably get the same brand which will match up to your old mountings. Don't forget to remove the knockout if you're hooking a dishwasher up, or you'll be trying to figure out why the dishwasher doesn't drain.

I've found that hot coffee also helps with unclogging drains. The heat and the acidity seem to break up grease, and the coffee helps clean stainless steel.