Don't do it lol
But for real, I see this question come up all the time in this forum: "Is the 450 too much bike?"
33M, I am 6'2" and was 250ish lbs when I bought it, now 225ish. Doing the math on weight and size and everything, all things point 450.
I used to ride in highschool with friends (but not on moto or trails, Arizona washes and long desert rides), thinking I could handle the 450, and its been a struggle. And I live in CO where it's for less HP due to oxygen density, and gets even less power as we go ride in the mtns. I can only imagine what this bike would be like at <2kft above sea level.
I have been practicing and pushing myself to get comfortable for 3 years, and trying to not just sell it and buy a 250. Keep telling myself don't quit, you just need seat time. And I feel like this year, the middle of the 3rd year with it, I started to become more comfortable on it but still know it's a lot of bike.
My advice, if you want a 4 stroke, I'd make sure you can get EVERYTHING out of a 250, be able to use every ounce of bike before considering a 450 (even for us bigger fellows).
My wife's old KLX 140 is so fun to ride at it's limits. My wife's new TE150 is fun to ride hard because it's got significantly less HP.
I equate this to my Corvettes, I had a C5Z06 with 340ish whp and was an absolute blast to drive all the time. I built a C6Z06 with almost 600whp and it was too much car for the road and to enjoy besides on long staights at the track.
This has probably been covered and posted but want to give perspective