i have been it doing it about 2 years now and run tho about 20 strains
it is really easy ............the size of the roots is what dictates the denseness of the buds and the over all amount .........then it just matter of balancing the amount of water u use .......to much and u get red vein from lack of nitrogen being absorbed ....too little and u get fluffy buds
the one thing u should always do tho is use fabric soil bags that way the water drains out if it is to much and the roots air prune so no choking up and giving u a small plant
and if u want it really really simple
http://www.ideal420soil.com/
just water with this soil........u can add in some extra feed now and then if u see red vein but it normally does not need it............just strait water 20/4 light and 65 days u should pull at least half power out of the plant .........if it is rated for 300 grams u will get at least 150 ...........ran this 3 times the results are the same (working on increasing it with feed now )
but the plants i used was la diva...berry bomb and thc bomb