when to transplant

i have 5 seedings in red party cups (8 or 10 ounces maybe?) and i am gonna transplant them into 6 or 7 gallon grow pots pretty soon. about when do you think i should transplant them?
i know its not good to do at a young age, but i dont want them to get root bound either. approximately when should i get them out?

check out my grow journal too! (In my Signature)

after they sprout and before they become root bound, but mostly it's prefrance; but personally i go from the jiffy mix or rockwool straight into my 5- gals and leave them there, id don't know but transplanting always scared me

2-3 weeks and you should be good.. just use a sharp as fuck exacto and slit down the side and bottom of the cups.. so easy to pop out..

squeeze the sides of the pot real firmly whilst moving it in your hand
this will loosen the plant and it should slide right out the cup

ok cool thanks guys. im scared to do it, i really dont want to kill my babies but ill for sure use my sharp as fuck knife and it should be okay. check out my grow journal and leave me some suggestions- im a first timer and obviously dont know exactly what im doin.