Would recommend researching on all stuff that someone say we "can't do", but we may not have a choice.
In the world we live in not everyone can just 'not use' a part of the house for a year, or buy another house. We are mostly working with friends houses and so far haven't seen even one that could just not use a part of it for a year. No one could buy another house, either.
So far it seems all influences are possible to balance, so if you don't have a choice in this, research and will likely find out remedies and other ways of understanding that can show you what to do.
We are working with very few houses we observe, so great for learning in details the differences, but some situations we dont really have present, so we haven't researched on. For example we don't have persons birth year clashing with the sitting, so have never looked into ways of balancing it. Logically, the Trigram(South) involves more then just what we view here, but anyway...
For curies/remedies Lillian Toos books are usually good source, however and we have found out some of the bad stuff is possible to balance very nicely with stuff from there, that specific factor likely is as well.
All this is assuming you already have a house clashing with birth year. If you are wandering what house to buy, that is a very different topic and not sure as important(as of course, it doesn't have to point to that direction at all).