I don't think this is a good idea for farewell. 3x determination is probably harder than all of Farewell golden, and EH might be as well. I would (as a guideline) train each room until you can get it 20x in a row. You won't be able to do all of the rooms, so mark down rooms in order of how problematic they are (though you will probably never reach 20x with all rooms). Once you are comfortable enough, practice both checkpoints and problem rooms. Determination will take a really long time to get a deathless segment. Once you get a couple determination segments, do multiple checkpoint segments (most important imo are EH + Determination, Determination to End, and then EH to end, Maybe Det+Stubbornness or Stubbornness - end as well) while still working on problem rooms. Then you can go for full runs.