Hi and welcome to the forum.
I'd second everything that has already been said, apart from Limecc, he's just anti SIB
especially Jeff's understatement "in sea lochs it can get rough"!
We got caught out in Loch Hourn last year
If at all possible, I'd try and organise a couple of trips out with someone with experience in their SIB before heading out on your own.
I'd also try a few trips from a beach (maybe not Morecombe), tidal river or an estuary, calm sea, sunny day, potter about close to shore. It will help you gain a bit of experience on moving water (albeit calm moving water) currents, tide times etc