To OC in Indiana you will need a concealed permit.
When it comes to OC, size is seldom a concern. I and many others OC a full size 1911 daily. Insofar as asking a LEO any legal question, that would normally be our last choice - they should know, but frequently get it wrong.
Benefits: You don't look like the typical, unarmed potential victim - deters crime. Faster response time when the SHTF. Educational benefit to others - normalizes the practice, invites other good people to talk to you.
Disadvantages - none of which I am aware.
Can't really remember when I didn't OC in this lifetime. Feel naked w/o it.