Samsung Galaxy A51 screen replacement

I know this is mainly a video game console forum but Steve has done work on phone’s so don’t get too mad. I have a 3 week old Samsung Galaxy A51 cellphone that has a hairline crack across the entire width of the screen, my local repair shop wants almost $200 to replace it, is it very hard to replace it your self? I know I’d need a heat gun of sorts to get the old screen off but how easy is it to screw up the whole phone in the process? Since it’s a brand new phone and the only scratch even on it is the crack on the screen I want to be pretty careful with it, any help will be appreciated.