I grow one at a time due to needs and space with a 250watt HPS, have got a Big Buddha Chiesel at day 4 atm... A basic explanation is you plant your seedlings into a small pot, you carefully remove the bottom with knife and instead of transplating (saves stress to roots and easier to water) simply place it into a larger pot... I dont use this method personally so cant tell you the inner details on it...
The idiom Green thumb is English and refers to good grower/ good with plants
Hoping for hard frosty buds for ya
Dom