Edmonds can be, and generally is, a long swim. With rare exception you don't get swept OUT. You get swept parallel to shore. Trouble is, south is a big ole' ferry with ferrymen that are very unhappy with divers in their landing area. It happens. Being swept north is a bother, being swept south can be much more than a bother.
Mostly it's a pretty forgiving spot with no or low current most of the time, but, if you go in on a big exchange, at max current, you will be dealing with current, possibly even stout current. Learn to read both tide and current tables. Edmonds kind of sucks on really low tides. It's shallow so you have to walk a LONG way out to get to water, then that water has terrible viz since it's dragged all the shore crap along with the outgoing tide. Then you have to swim a long way to get to something that doesn't resemble soup. Often not fun.
For that matter, Cove 2 can be very tricky to downright dangerous on very low tides. You end up getting into the water and finning up among some nasty slippery bottom garbage, generally also with no or low viz. A friend (experienced diver) fell in that and almost took an eye out on a metal bar sticking up. It certainly can be done, but you need to be aware and careful. Help one another in and out of the water.
Yes, the 'this is life support' can get you to buy really expensive regulators, computers, and BC's. Now being broke you get a wetsuit, freeze your butt off, and quit diving. It happens a LOT. You absolutely do not need a Scubapro MK25 +A700 to stay alive in the Sound. My reg is 20 years old and works fine. Until you can stay down longer than 45" AND do 2 dives in a row you don't need a computer. What you need to keep diving around here is a drysuit. Once you have a drysuit a really expensive BC becomes almost only a device to hold a tank and float you on the surface. There are other, and better options.Oh, don't buy and AL tank. Good reasons for that, but just hold on to the idea for now.
Yeah, it's a bit more complicated than explained in OW1, which is written and geared toward tropical certification. There should be an entirely different course for cold water, like way different.