No sweat. Iwouldsuggest Dr Bronners bar soap. I switched to BS washesabout 2 months after getting tnr and keptat itfor another month. Never again. It actually gave me dandruff, when before it was itchy yes but no flakes you could actually see in my hair. After I switched to Dr Bronners, no flakes after a couple weeks. BS worksfor some but not all..
I went almost 3 weeks before i washed for the first time after twist and rip. Granted I only washed abouttwice a week before dreads.At the beginning,when my scalp was getting used tonew dreads, I would wash every 3-5 days just cause my scalp was so soitchy! Now prolly every week and a half to two weeks. So my advice would be to go as long as you can before washing that first time, after that listen to your scalp..it will let you know when its time to wash again 
I sleep with a tam on most nights but i heard sleeping on a wool pillow case also works. Im washing with bs/acv onlyright now because its so gentle on mybaby dreads.. Just pour it on and rinse it off,no scrubbing necessary.
