Well I hope you have cruised through the wind without incident. As many have said 25kts is nothing to be worried about. Will get a bit noisy perhaps but you'll be ok.
As you might have gathered from other comments, most cruisers are wary of mooring balls because we don't know how well they were put in and maintained without inspection
We ourselves usually prefer to anchor as we have put a lot of time and energy into getting our anchoring
kit and technique correct and we have learned to trust "bertha" our anchor in more than twice those winds.
Sea state is more important to a great degree so try to make sure you are on a protected shore and there is little fetch from the land to your mooring/anchor. This is even more important than just protection from the wind, as the seastate will bounce you and stress your ground tackle more than the wind itself.
With that, make sure you have a good snubber (catamaran, you'll have a good bridle
or two good mooring lines with some stretch in them), stretch or "give" in your gear
is important to absorb that shock and not break things or pulls things out bottom.
Make sure you have chafe protection in place, from using two lines to stop "Sawing" to actual chafe protection on the lines where they go through mooring rings etc.
A reliable anchor alarm
is a must and a plan for if you drag or break loose is important. you don't want to wake in the middle of the night in panic about what to do. On that note, take note of land marks that you can see at night, getting your bearings of where you are and how you are orientated is more difficult in a hurry at night.
Doubling up your lines is prudent, but , as others have said, I wouldn't bother until it gets double your expected wind speeds and at that point I might be moving onto my anchor anyway :-).
The rest is about getting used to the noise
and motion. Building confidence in your abilities and gear
and allowing yourself to sleep. If really worried , split the night with an anchor watch between yourselves until you have built your confidence.
The best ally you can have is prudent thinking and caution. So right now whilst you are worried and not over confident, you are in the best of positions.
Enjoy the ride.
BTW, we have an impression as new sailors
that if your tackles breaks you'll be sailing through the anchorage at great speed. The truth is you'll be drifting slowly and you will have time to react and intervene. This is the reason those that get too comfortable without an alarm or anything, sleep comfortably through their journey whilst others try to wake them from afar when things do go wrong.