Yup. Always clean up after its poop, never let the hearts drop below half, don't miss any calls for disipline (but the training does not have to be full) and put it to bed at 8 pm (or a couple minutes before) and don't let it sleep in poo. Good luck!
To get your MAMETCHI you want so much, you have to have a ichigotchi or hinotamatchi teen. Treat them with the best of care making sure not to let any hearts drop. After 3 days (when it has turned 7) you should of successfully had yout tamagotchi turned into a mametchi!
I just got My Mametchi, only got this Tama at Xmas and all I've done is kept good care of it, Hearts have gone down mainly on Happiness. But even though i got a Mametchi and yes it is Cute.