@SkyWhisperer - I’m glad that worked out good for you. However, some automotive repairs can’t be done on your own and unfortunately you’ll have to go to the mechanic in those cases.
You may have a pump with a leak that needs repair, and if the pump is out of sight or down where you can’t get to it very easily, you’ll have to take it to the shop and get it repaired.
But in terms of the actual complexity of the job, I agree that most mechanical seal repair jobs are fairly simple to perform. There are factory made parts that will fit with exact precision for the make and model of your car.