TOM-1:
I commend you for wanting to accept the challenge of PSD. Two things, one of which is the most critical. You really need to investigate your area and determine where and who you would be diving for. I do not know the Canadian systems, but you would most likely have to be associated with an FD or a PD in order to do this work. If they only have paid roles, then it may be a moot issue unless you can get hired. If there is a volunteer team or reserve personnel, then it might open the door for you to participate.
Also, just do a search in the PSD site. This has been discussed in the past and there are some Excellent posts regarding the mental aspect of PSD. That is a key ingredient to doing the work. I suggest you find and read those posts as it makes the work very vivid.
Good luck and do not take these comments as though you cannot do it. You just need to find the proper avenue to allow you to funnel your desire.
Dive safe!
Dan