i tried that wit my predators last year...didnt work. but as no steeze said, theyre leather so they are gonna stretch out a little. if your foot isnt growing right now, then its a better idea to have em kinda tighter. i have the nike vapor SL. those are super tough cleats and just absolutely nasty and i wore them in the shower and they mold to your feet. but yea, wear em around the house or whatever but break em in so you dont get blisters when it comes time to play. i always take about 2 weeks to break my cleats in but when i had predators i didnt need to break em too much cuz they never give me blisters. but on the other hand, i have always had to break in my vapors and all cleats are different on everyone.
Also what i did when i first got my cleats, is wore my old cleats for the first half and then the second half i wore my vapors too see if i need to break them in a little bit more.
But overall, if your foots not growing, then its fine to have tighter cleats so dont stress it, they will stretch cuz they're leather.