First thing you need is to gather your material. You need 12/2 romex, 20 amp breaker, proper tools, proper fittings on as needed basis. Then begin to route your romex from dishwasher to electrical breaker panel. The best way to run this wire is through floor but sometimes that is not possible. Routing through wall space, running up or down between wall studs is the most difficult. Sometimes you will have to penetrate the floor or ceiling base plates. This is the doubled up layers of wood in top and bottom corners of the wall that gets you to the attic or basement. These wall plates usually have to be drilled at 45deg angle with a high amp slow turning drill and 8-12inch wood bit. Some of the very old homes(100yrs and older) have oak and 24 inch footers that block your route under the corners of the house. I can’t go into a large part of routing because of so many variances. If you get your wire run and need help with the wire connections only, then it would be good time to use my service. Most of the time pulling the wire is technically easy just a lot of hard work. So get that done before asking any questions.
If you are stuck on something simple that is fine too. You are welcome to come to this site and ask anytime.
Go to bottom of any page and login. If for some reason you need to ask any questions about any other task besides the one here and you cannot find where that task is located send that concern to me below and I will give you the link on where to go.