Interesting that you bring this up, as I just changed out a bracelet myself not a half-hour ago.It should be here in a couple of days.
As I don't have proper Bergeon tongs assembly could be a bit tricky.
You don't really need a pricey Bergeon tool to do it. A fine fork spring bar tool will do, both for removal and replacement. The end links make it a little tricky, but not insurmountably so.
If you will need to resize the bracelet, opening a link now would be a good idea. The whole exercise is easier with the bracelet open and flat.
You'll be fine. Just be patient and prepare to say scheisse a lot.
If all else fails, there's always a jeweler--which is a helluva lot cheaper than a Bergeon tool (though serviceable Chinese tools are available from Amazon for about $30 USD).