The joys of being a line training Captain :-)
Speak to them. Its actually quite company dependent. And take the LTC's lead on it.
I would imagine that if you are working somewhere that has alot of cadets flying it might be quite a hard rule and the management are more than happy when it occassionally occurs.
In my TP world we also have a visual/IMC change where its 1000ft if IMC and 500ft if you are visual with the runway even if flying the procedure.
And never change your speed if you have been given one without either being told or telling them that you are doings so.
eg "speedjet 123 unable 160 to 4, reducing at 5"
Then be ready for being told to go-around. The more warning you give them the less likely that is. But check with the boss before you say anything. Some will see it as being switched on and others will get the hump, some like to use the +-5knts as an excuse that you can reduce. It can really screw the controller over though if they are running min spacings and you do reduce without telling them.
And as for RA not really it all depends on the local terrain. Again its a company policy thing ask your LTC.
You need to have a bit of paper with you and as these questions come up take a quick note of them and on the post flight debrief ask your LTC.