You can do this yourself if you have reasonable diy skills and a toolkit.
Unplug the appliance from the wall socket first.
Take the lid off the appliance, then open the door and take out the retaining ring holding the door seal to the front of the appliance. Just pull the door seal lip back to see the retaining ring.
Peel the door door seal off the front panel.
Now take the retaining ring off that holds the seal to the tub.
Pull the door seal off and out of the machine through the port hole.
Fit the new seal to the tub, refit the retaining ring to the tub seal.
Fit the new seal to the front panel, refit the retaining ring to the front panel seal.
You may find it helps to pull the machine out a little and tilt it back, this gives a couple of inches more hand room.
Look carefully at how the original seal is fitted before pulling it off, this will help you in the fitting of the new seal.
Good luck with the repair.