I'm a total lefty...although I can use a mouse left or right handed. Other than that everything is left.
One of the big things about being a lefty is when a righty is trying to teach you something. My boyfriend had an awful time teaching me to golf and my mom is a lefty and recently started taking crochet lessons...the teacher said it's hard to teach someone "backwards."
I also get made fun of sometimes because I make my check marks backwards. Like when I am checking off a list, my checks go left, with the smaller side to the right and the longer side on the left. It sounds weird, but for some reason people notice this all the time
I thought I was the only one - now I know there is a t least one more that does it this way
Also eating can be a pain sometimes. If the person at the table to your left is right handed you are constantly knocking elbows!
Unless you run to the table and pick the one of two spots you can sit at. I hate round tables for this reason. Al least know most people I go out with just stop as we approach a table ans ask where I can sit before they pick a spot.
I adjusted to spiral notebooks, but I turn them totally sideways to write in them. I do it on all paper, it has to be totally sideways so the lines are going vertical instead of horizontal.
I sometimes have a hard time with lightbulbs and screws too, I want to turn them the opposite way they are supposed to go!
That was me until I learned "righty tighty, lefty loosie". I was well into adulthood and sometimes I still have too repeat it as I put the screwdriver in my hand
Other than that, I love being left handed! We are a fun and creative bunch! Your son will be fine. Just don't try to "make" him a righty, it'll never feel totally natural to him.