All very easy to do. However when looking at companies to use, look for THALYS. Train tracks in europe are like US airspace. More than one company uses the train tracks. If you look at the THALYS schedule this is were you'll find the first class fare of around 150.00 give or take. When I looked at the french train company the fare was twice the price. You can either buy your ticket on line or at the station. Again very easy to do and don't forget to get the express run or you'l have to change trains in Brussell.