How To Tell If Pumpkin Is Ripe For Picking?

Well, I am not sure so I googled! One of the website says: a) If the pumpkin sounds hollow when you give it a slap, then it is ripe b) Use a fingernail to to gently puncture the skin, if it is hard then it is ripe c) When the stem above the pumpkin turns hard, it is time to pick! Wow, I need to try it tomorrow! :-) It was pollinated on 3 June so barely 1.5 weeks! Wow, it grows fast!