I've adjusted my SKX013 which has the same 7S26 movement as the 007. It used to gain time, which was annoying but tolerable. After 5 years it was losing a minute per day which is definitely not desirable. Borrowed my friend's all in one tool kit (the kind you get cheap on Amazon) and fixed it myself. Watched all the videos and read all the forum posts. They all tell you to only just nudge the adjuster. I had to move mine maybe double the width of the tick mark stamping. In any case, you can always go back and adjust it the other way. Just make sure you move the correct one.
On Android I found a couple apps for watch tuning by counting the ticks. They work surprisingly well and match the actual gain/loss measured (both mine and my wife's Swiss movement). I'm sure Apple alternatives exist as well. I don't dive so didn't need official re-sealing but it was good enough for snorkeling and generally being in the water all day. I mean, it's a screw down case with an o-ring, it either works or it doesn't!
Have fun!
