Get your dad to show you. The Internet is great for some things, but it helps to have someone to ask when learning a new trick.
Getting tyres on and off rims is tricky sometimes. Likewise getting the tube nicely located so you don't pinch it.
Everyone has their own way, but most ways are broadly similar.
Changing a tyre on a bicycle is simple only to those who do it. You are no different from anyone else in finding it a kerfuffle before being taught.
I've shown my kids over the years and it's been interesting to see what their assumptions were and whet they found difficult as they learned.
A lot of it is to do with how comfortable you are putting a lot of pressure on the beading of a tyre and knowing how hard you can 'shove' to pop the beading over a rim.
Tyre levers (often necessary on non-folding tyres) can also appear to be bizarre Oriental torture devices until their use is taught by someone who can lean over and assist when needed.
For all those reasons and more... ask your parent next time you're around to show you how it's done.
It can take a few goes to get it, but when you do it will stay with you forever.