Can one prepare and bathe for the mikva at home and then go to mikva and immerse without bathing or showering at all at the Mikva? I heard that one should be wet before going into the Mikva. Is that true?
Answer:
There is no requirement to be wet upon entering the MIkvah.
If the entire bathing process is not being done in the mikvah, common custom is to take another [quick] shower and comb out the hair before the tevila. This is because there is generally some time span between the bath and tevila, even an hour or so. If however, a woman bathes/showers and immediately goes straight to the mikvah, there would be no requirement to shower again [some prefer to do so anyway,which is fine], even if she is dry.
Keep in mind that this is with regards to chafifa/bathing/cleaning. In any event immediately before tevila a woman must carefully and methodically check over her whole body, not in a rushed manner. This is crucial from both a halachic and practical standpoint.