I always have decent luck here on the Twin Harbors if it isn't raining. I just drive on via the nearest beach access from my house (1st approach you get to in Grayland, when heading S) and head either N or S about 1/4 mile. You should see hundreds of vehicles and many hundreds of diggers. A clam shovel is easier on the back, but takes a little more skill. I've been meaning to get another one since the handle broke on my old one, but I have one of those white PVC tubes that I use. Harder on the lower back, but I try to use my legs to pull it up. The pressure on the surrounding sand produced by one of these tubes causes any other clams within a few feet of theone you are going after to "show." You find one, punch down for it, and a few others make their presence known. Nab 'em quick. Tell any lurkers trying to dig off you to get lost (I have had that happen!)
Rules state that you have to keep every one you dig, regardless of if they are smashed or broken. Half a clam counts as one clam if you can't find the rest of it.
I use scissors to clean 'em. I bread 'em and fry 'em up, about 2 minutes on a side, max. Any longer, they get tougher to chew.
Run 'em thru your meat grinder for making chowder.
Start no sooner than 2 hours before the low. At low tide you are done. I often head out about 1 hour before the low. Quite often, there will be a lot of "shows" up higher on the beach near where others have already dug earlier on the tide. Near low tide you will see a lot of diggers right on the water's edge, some even digging in the water, wearing hippers or waders. Meanwhile the granny in tennis shoes is digging her limit up higher on the beach, staying high and dry.