Transitioning to formula (Any tips?)

I am reaching the end of my exclusive pumping journey. It is just very time consuming & it has started to take a toll on me. I want to start easing my son into formula the day he turns 5 months which will be on the 6th of November that way by 6 months he’ll be completely transitioned. I read this article where this girl gradually would switch a bottle of breastmilk for formula everyday & then each week she would add another bottle & i thought that was very smart. If you have any other tips for me please let me know. Also what is the best formula for babies to start off on? He does still have a bit of colic too already. I had received a bunch of containers of similac while I was pregnant. I have 2 Pro-Sensitive & 3 Pro-Advanced. If you’ve tried these for your LO how did it go?