how do you work that out, when you and exit out side from bedroom and from the front of the main house

Frankly hard to understand from one sentence. For example how big or small this bedroom.

For pratical reasons, if one is using the Flying Stars, map it onto the entire house. And locate the sector this bedroom is in. And apply the relevant enhancements or cure (if any).

In my opinion, this is the most practical common sense approach.