Don’t forget you probably have a Tri Sim. Use as is or push out the size you need. Also I hope you kept the original pieces just in case you have to make it bigger.
If your new phone uses bigger sim than your old phone you may need a sim adapter.
I have a spare one from nano to micro.
Where about are you located?
It's quite simple, all you have to do is take the sim out of your old phone and put it into your new phone, the number and everything will remain the same.