To change the bezel it is easy if you have a "watchmaker" knife.
Try to tackle in the right way at the crown position.
Please be carefuly not to lever at the crown- you should lever between case and bezel - under the bezel.
To put the new bezel on the watch you only should take care about the springs inside the bezel- their are two springs.
The first one is fixed in the bezel - it is to hold the bezel on the watch.
The second one is loose and you should put in the right position - their are two small "noses" - also the bezel have to small "millings" to put in the noses of the spring.
And than turn and push the bezel on the watch - maybe this needs a little bit time and practicing - but you can´t destroy something.
I think some watchcollectors are already able to do this - after some practice.
I hope you will try and fix it !