I am planning to loc my hair and wanted to know are there locticians (in house or salon) in the Harlem area?

I think you should do it yourself or at least do the grouping yourself. Dreadlocks have meaning and when you let someone else do it they can screw you up mentally. Your locks are a symbol of growth, wisdom and strength. Buy some beeswax, hairspray and gel and just take a day off to do it. *Note* They will stick up str8 and look funny at first but they will eventually settle.