Before we start..
For those that CBA to read... or just want a quick answer... or dealing with Myth #1 - IEMs are expensive:
IEMs can be expensive for sure, however, a simple, great sounding solution can be had for less than £100... Just don't do a Macgyvered half baked approach to IEMs and then claim they don't work for you!
If you are dipping your toes in the water, a Behringer P2 (or one of the similar copies that are now appearing on the market) into your