u/Fun_Report9139

I'm toying with the idea of replacing the crystal and gasket on this, it's a little scratched. I've done plenty on automatic Seiko's (movement out first, from the back) but never opened one from the front. Straight forward, or best left to a pro? Many thanks!

*Update - thanks for all the replies, I really appreciate it. New to this so I'll get more photos uploaded. No notch on the back I'm fairly sure, but definitely a notch under the bezel at 6.

I've just taken delivery of this Seiko 7546 Quartz. I've tentatively tried to open it as I want to change the crystal but I'm not sure I'm using the right technique and I don't want to chew the notch. Any advice? Thanks.