<<decsisions decsisions!>> One suspects that you are not in the UK so I think it would help responses if you said where you were so that local controllers could respond.
I know of no en-route procedural work in the UK and possibly none in Europe, radar having superceded procedural in many busy areas. I practiced the black art of procedural approach and en-route some 40 years ago and in those days I considered Approach procedural to be much easier than En-route.
Judging from your other comments I don't think you have too much experience of ATC so I strongly advise you to visit a local ATC unit to see what goes on.
Lastly, you shouldn't "screw-up" on any sim exercises if you have absorbed the training.
Good luck.