Maxxis High Roller UST 2.1

I just change my rear tire maxxis high roller 2.1 with New Maxxis High Roller UST 2.1. My old tire had been used more than 2 years, and got flat 3 times during that time. This high roller pattern is my favorite, because it can handle in wet, slippery, hard pack soil with my riding style. The bad news is when I can’t change my rear tire with the new high roller because I already brake 2 tire lever to put this tire in my rim. I don’t know why this tire its so hard to put in my rim. Are this because my rim model or anything else. So I bring my rear whellset with the new tire to bike workshop. They can put my new tire in my rims, and say “ I hope you don’t get flat tire in the middle of the jungle because its need lot of hardwork to put this tire on your rim…”.