Once in the water it's best not to try and walk. Otherwise you will soon realise there is little friction and the slippery feeling isn't pleasant. I suggest you start swimming straight away. It felt heavy at first and my first 5-6 kicks weren't great. It felt like a drag and initially I didn't move fast and my limbs felt a bit heavier than usual. But very soon after, I felt the gliding movement and it felt absolutely brilliant.
I also bought mits and after 3 laps or so felt brave enough to put them on. Once I made sure those ladies were still absorbed with each other that is. Together the mits and flippers made the swim a good good good one.
*note this isn't a long-blade fin. So it's not a cheating fin. heheh