You can definitely grade your own comics if you want. Before you can sell a valuable comic, you must authenticate its value, grade it, and slab it to prove its value to the buyer and seller. There is a process to grading that requires discipline, but you can do it. Should you grade your own comics? That is another issue. It is hard to be impartial when you are grading issues you want to sell for the highest amount possible in the future.
You should grade your own comics to better understand the process before hiring a third-party grading service to do it professionally.
