I did mine about 2 weeks ago and i just popped the clips off holding the two heater box halves together,but i missed one clip up on the right hand side by the kick panel and broke the heater box in that area. Not a big deal... It still sealed. Once I got the two halves apart I removed the 4 screws that held the heater core in place, then I removed the bracket that holds one of the heater cables between the heater core tubes. Then slide the old heater core out and put the new one in put it back together. All in all it was my first time changing one it took about an hour and a half. Unless you have factory A/C then it will be a little harder to do.