I need to replace an indoor railing, balusters, and newell post and need
some advice as I have not done this before.

Is this a project for a reasonably handy non-carpenter guy or should this be
left to a professional?

If I decide to tackle this, not quite sure how to measure it out before my
trip to the local Home Depot or Lowes.

Any advice from those who have been there done that is appreciated.

thanks,