You don't say if you already have the bracelet and if it is uncomfortable and/or does not fit your wrist properly because of lack of fine adjustment?
Or, if your "getting cold feet" ...
What I can tell you, is that the bracelet is super comfortable, looks real cool and has all the quality of an IWC bracelet which are truly among the best in the industry.
Having said that every wrist is unique - and of course it's possible that the standard setting is just to tight etc. However, your AD should provide the service and work with you to then ensure you have a half link to add or remove the half link and replace with a 3/4 link ( for lack of a better name - the last link on the bracelet which sits as standard against the clasp).
You won't regret the bracelet - enjoy the anticipation if your still waiting for it.