if the main entrance is south opening what is to be done

Every direction including North-North North East have certain positive and certain negative points for Main door location. If the Main entry is exactly in the South it means-Gains and increase in wealth/business. So you may not worry too much if the Main entry is located at exact South. However if the location is SSW it means-loss of wealth and business. SW entry implies-Increase in enemies and pain due to enemies. 

A proper analysis of the layout however always helps accurate inputs

Thanks

Sabina Vanjani-Vastu Analyst

www.vaastudrishti.com