The practical is not hard at all. It is quite basic, and applicable to all from PPL up. Most people training get exemption from it by having a certain amount (16 hrs iirc) of their training flights noted as r/t used and barely realise it exists.
Mine was a while ago but i sat in a booth with a headset on and a simple map on a bit of paper which gives you a scenario flight. You call for start, ready for departure etc, get airbourne, hand off to enroute controller, cross a matz etc and then maintain silence whilst a mayday occurs on frequency.
Its probably a bit fancier now with different types of traffic service etc but not hard.
There is an old thread on here where one of the guys is a RT trainer - might try asking there if this isn't enough to reassure you.
http://www.pprune.org/atc-issues/262...nfusion-2.html