Hello D Lassiter, You can do this repair yourself with just some basic tools and a little patience and assistance.
You'll need to remove all food from the fridge as it will take at least 45 minutes or longer, depending on how well you do.
If you roll back the door gasket, you'll see the fasteners that hold the gasket in place. Remove these starting with the ones on the bottom edge and then the sides. Finally, remove the top ones, leaving the two top corners for last, that way you can have someone help hold the door liner, so it doesn't drop to the floor and get damaged.
I would also suggest that a day or so before you're going to do the repair, that you let the new gasket lay out on a floor somewhere where it can't get damaged so it will relax and get most of the kinks out of it from shipping, etc.
Then simply put the gasket onto the door liner and reinstall all the screws back onto the door frame.
There are some models (you didn't provide a brand or model number to zero in on the exact version you have) that have the door gaskets glued onto the door frame. On this types, you'll have to use either a plastic or metal putty knive to gently run around the entire edges of the door, between the gasket and the door frame, to get it to come off.
Then you'll need to have someone help you reinstall the new one, as you'll have to reglue the gasket onto the door frame. This will require some non-marring clamps (about 4-6) to hold the inner door panel and gasket onto the outer metal door frame, while the glue dries. Typically, this is done with the fridge door removed from the fridge and takes at least a day once it's installed to glue in it place and fully cure.
In either case, please go to the link below and enter in the model number of your fridge so you can see which type you have and get a line drawing that shows the replacement parts you'll need. You can order them anywhere you wish, it's just very convienent that Sears provides the info for just about all brands of appliances made.
You can find your gasket part at www.searspartsdirect.com
by entering in your model number for your unit and looking at the drawings and parts list provided.
You might have to look under the inner door panel edge, hence the reason to look at the middle section or corners to make this a bit easier to do. You might have to remove the inner door panel from the gasket first, in order to get at the screws that hold the gasket onto the metal door frame.
Don't pull on the inner door panel too much, as you really don't want to crack or break it, since your goal is to only remove and replace the gasket. Take your time and you should be able to get it off and replaced.
Of course, don't remove this until you've got the new one available and then allow plenty of time to do the job, which means getting the fridge and freezer emptied completely, so have plenty of coolers available with lots of ice!
I hope you find this Very Helpful and best regards!