How hard is it to get a second job

I am a Croat whos going to work here next summer on a J1 Visa. I know this exact question has been asked before but the responses are polar opposites of each other, some are saying that local restaurants and hotels are begging for more workers all year long, others are saying everything is fully staffed by June and you need to come early and knock on a bunch of doors and pray you get lucky. Would prefer a tippable job as a server but anything that pays at least 20 an hour will absolutely work for me. Locals only, if I spend an hour or two a day knocking on doors across restaurants and hotels, how soon (or late haha) do you reckon i'll land something