Long story short -- we had a home inspector check our place out (the single detached home, not the apartment), and among other things, he identified that our fuse box at home in woefully inadequate and poorly set up. We've been living there forever since we immigrated to Canada eons ago.

Apparently a lot of stuff are double or triple tapped, and a total amperage of only 100A is kind of inadequate.
So we are looking to address that. The problem is, I know absolutely nothing about how these things work.

The home inspector only gave us some very rudimentary suggestions of how the process goes -- it pretty much boiled down to go find an electrician, someone needs to arrange with BC Hydro to have power at my place shut down / cut off from the grip, the electrician does his thing, we pay him big bucks and off our merry way we go.
I did some basic Googling and have a rudimentary understanding of why double tapping is bad. (And triple tapping therefore sounds like super extra bad.) I know the right thing to do is to get it done, and I am reluctantly planning on doing that. The 2 big questions that I have though are:
1) what exactly needs to be done, and in what order / procedure?
2) how much hurt is my wallet going to see?
Would appreciate some insights if other fellow RSers can chime in and shed some light.