I've never heard of anyone hiring an inspector. What I recommend is take someone along with you, especially if you have a friend or family member who has been through this process before. A second set of eyes who is impartial & help to catch deficiencies can be very helpful.
When you get into your unit try not to get too goggle-eyed. Look around and enjoy your new home then focus and get to work. Go room by room and thoroughly inspect everything, wall by wall and window by window. Check everything from outlets (socket tester or something small you can plug in) to the quality of workmanship of cabinets, tiling, hardwood/laminate, counter tops, that walls are straight, windows open with ease, sliding balcony doors seal properly, doors all open & close with ease and engage properly etc etc. Do not let anyone rush you. Note every single item in detail that YOU believe is a deficiency or anything relating to poor workmanship, don't let anyone talk you out of "that's the way it should be". Write everything onto the Tarion report in pen and ask for a photocopy when you leave.
Finally, it's very common to walk into an empty condo of which you have been staring at floorplans for months - or years - and immediately think it's smaller than you thought it would be. Prepare yourself for that.
Good luck!