First of all, glass cockpit has changed many requirements.
So these suggestions only apply to analogue displays
Make sure your Long Brief is detailed and get Hoskins to take decent notes.
Make sure he knows and understands what the "6" instruments show and the relevance of the T display.
Go through each instrument function separately and emphasise it's limitations.
Introduce Selective Radial Scan.
Go back to basics and point out stuff he/she already understands e.g. Power, Attitude, Trim.
Compose your lessons around initial exercises of S and L, C and D., Rate One turns and anticipation of rollout on headings. Keep it simple and don't rush it. Don't go on to more advanced exercises until the basics have been thoroughly understood and demonstrated.
Relate your patter to visual flight and then show how these references are degraded to produce the requirement for IF.
That'll do for now, oh, and as has been sensibly suggested already, a bit at a time say 5 to 7 minutes with a rest in between to enjoy the cloud tops.
There'll be a lot more to do particularly eg.Unusual Position Recoveries.
If you do it right, you might save someone from a big fright or possibly even killing themselves.
It's your reputation too.