Know Your Local By-Laws

There are a thousand or so web pages, videos and blogs about how to plumb.
All the self help tips you could ever want.
BUT.....

You really need to know your local codes and by-laws.
There are different laws and codes for different Countries, Regions, Provinces, Cities and the list goes on and on.

So, If you want to do your own repairs, great... all the power to you.
However on a personal note, It would be wiser to get a qualified trades person to do the work.
They would know your local laws and codes.

An example would be adding an ice maker to your fridge.
I saw a video on you tube where a guy was showing you how to install a saddle hub to get water for the fridge.
In the Province I live in, saddle hubs are against code. (However you can buy them at the local Home Depot)
Another thing you have to watch for is all these new plumbing items that are supposed to make plumbing installations easier for you.
You can buy them at Home Depot and other big box home renovation stores however if these items are not CSA approved, you shouldn't be using them.
I'm not picking on Home Depot, their just a store everyone can relate too.

I can go on and on here but I will just add some more posts as we go along here and address items as they come up.