So when u say you are auto tech vocation, are u generally known as B-mech? B for B vehicles..
While some maintenance jobs are outsourced, it doesnt mean that you are not needed. Your job is prob to provide support while you and your unit is outfield. You can't expect the uncles and civilian workers from the outsource company to travel into the field to provide service.
As your first ICT, if you meet your buddies from your active unit, thne it's prob the whole batch of your unit forming the reservist unit. Then this unit will go thru the whole NS cycle and you all will MR together. If this is the case, then the first ICT should be quite relaxed. Refresher training, ippt etc. For the combat pple, will prob progress from section training etc..and thru the years platoon then company...then the whole battalion...thus another test for the unit.
If you are joining existing unit, then expect the unit to be somewhere in between. Maybe already battalion exercise etc. - that's when some new guys joined my unit halfway, when my unit already some years into the cycle.
Also ITI is just a name. It doesn't mean you are in ITI or posted to. ITI support the unit that is in training.