Impeachment is an unusual process. There’s only three other ones in the past to look to for precedents. Moreover, none of those three had accusations as serious as the present one.
Of the three, only the Andrew Johnson impeachment happened in a situation anywhere near as polarized as the present one, and that one happened in an effectively less polarized situation, since (with the exception of Tennessee) the states which had seceded had not yet been readmitted to the Union and therefore had no formal representation in Congress.
We are, in other words, in uncharted territory. There is really no saying how this will all play out.