1.
the first thing to do is to do is to decide whether or not there is a PWP you really want and to make sure that at least one villager of the personality that suggests it is walking around town. For the purpose of this guide I will choose the "Illuminated Clock" which is suggested by Peppy villagers. Tutu is my only Peppy so I made sure that she was walking around town before starting.
2.
this next step is optional. but I like to dig holes around my villagers to make sure that they stay in one place. this makes the process quicker because I don't have to be running all over the map looking for my villagers. I'll know exactly where I need to go each time.
3. this step is also optional. BUT HIGHLY RECOMMENDED. at this point I empty my pockets, keeping only my tools. afterwards I fill up the rest of my inventory space with either seashells or flowers. basically: my inventory should be full of things that villagers can't ask for. by doing this I will guarantee that they will not be pinging me to ask for items.
4.
afterwards I'll put on my wetsuit and run the beach.
5.
I get in the water and stay there for at least 5 minutes. when I return to the land I walk around my villagers to see if they ping me. Since I really want a request from Tutu (the illuminated clock) I usually go to her first. But if she doesn't ping I just talk to the rest of the villagers.
6.
Sometimes though a villager will ping you for something other than a PWP. They might ask you to change their catchphrase, greeting, might come up with a new nickname for you, ask random questions, or sometimes even ask you for favors. If this happens just repeat steps 4 through 5 until you get a request. Sometimes you'll get it on the very first try. Other times it could take much longer.
7.
depending on your luck and on how long it takes for you to get a suggestion, villagers might stop pinging you all together. when this happens, select a villager you
DON'T want a request from. I selected Whitney since she is Snooty and can't suggest the Illuminated Clock I want. After you've selected a villager go and talk to them and they'll tell you to take a rest. Don't take a rest. You can use this to your advantage.
8.
the very next villager that sees you after being told to take a rest will always ping you. so naturally I rush to where I had trapped Tutu and she pinged me with a PWP suggestion. she asked for the illuminated tree, not the illuminated clock. but that's fine, I decided to just keep playing. though if you get something you don't like you can always just quit without saving and try it again. up to you. personally I just keep whatever I get.
last note: villagers will SOMETIMES recommend more than one PWP a day. but it's VERY rare. so after getting one PWP suggestion its better to stop doing the diving trick. cause after that you'll most likely just be wasting your time. and then you can just try it again the next day