Laggie
Your profile doesn't say if you have actualy flown a helicopter. Many people think that they have the ability but when it comes to sitting in the seat with the controls in their hands they freeze or overcontrol.
The usual failure during training is reaching ones mental capacity to assimilate all the information coming in. During critical phases of IMC flight information can arrive from many sources, eyes for the all instruments, ears for the radio and the dreaded inner ear giving you the leans where you head erroneously tells you one thing while the instruments tell the truth.
I have seen good VFR pilots come apart under the stress of IMC - they have spare mental capacity while flying VFR but not enough when in IMC.
The only way you can tell if you have the ability is to try - unfortunately it can be an expensive way to find your limits
332M