Yesterday I ordered the band and bezel for my GWA1100 (something which I've been wanting to do for a long time), and I saw the bill included the service charge for changing the band & bezel. It'll take roughly 1.5 months to get delivered. So, I'm not sure if I should try to change it on my own (it'll be my first time doing this) or trust them to change it without opening up the back panel (and possibly messing up the water resistance seal). I know I'm being paranoid (it's a Casio authorized shop) but I love this watch way too much. So I thought it'd be best to ask you guys for advice. If it's easy to change the band & bezel on my own, or it'd be the best option for my watch (and for me) to trust the experts and let them do their job.
PS I apologize this was weird thing to ask but as I said I REALLY love this watch.