u/Firebreed30

My girlfriend and I got these cards years ago when the Team Up set first came out because I really enjoyed the cards so I bought us 2 booster boxes to rip open for our anniversary. We have periodically been watching the prices on them and are now astounded by what they could be worth. Question is how would we go about grading these? We both now have the fear with the amount of cards being stolen through mail that we will lose them or they will get damaged somehow (Especially Latios & Latias). What's the best course of action?