Starting the natural dread process.... a question about hair length

Howdee folks,I'm planning on starting the "neglect" natural dread method, my first time attempting attempting to dread my hair. Right noww my hair is naturally straight/wavy and down to the small of my back. In the past I have gone without brushing it for longish periods of time and noticed it knots up pretty quick, but I'm worried that at this length, even if I rip knots apart to try to prevent it that I will instead end up with one large dread rather than several smaller ones. Does anyone have advice on dreading very long hair or a good length for starting young dreads?(I aplogize for any mistakes in this post or if it is misplaced as I'm having a hard time navigating thru my phone since Irene knocked out my campus internet....)
updated by @cam: 01/13/15 09:09:19PM

long hair dreads faster so u will have to seperate more but you'll be fine

just let it dread and seperate as needed

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My new book Ban The Taboo Vol 1

Yeah, some of mine were thick so I tried separating them but within a few days if was too hard to separate the whole thing, so that is a problem. Just don't leave them long enough to do that, separate them often and it should be fine