Trust that there is ALWAYS something better out there. If you do not get this or that house, it is OK.
Check out
www.realtor.com to see what other houses are being listed in a particular town....and at what price.
An even better website for real estate in massachussetts is
www.newenglandmoves.com It lets you see houses currently for sale as well as what houses recently sold for.....and it shows you the street addresses.
Most importantly, the one thing you can't change about a house is location. Be picky about that......everything else can be upgraded later.