Rear Caliper Bolts - How?

[GeorgeRunner]

Over the weekend I replaced my brake pads up front - and went to the back, and COULD NOT get the caliper bolts to budge. They weren't rusted on that I could see, but I gave them a shot of PB catalyst anyway (to no avail). Does anyone have experience with removing these bolts to get at the rear pads - if so, any tips or tricks? I'm a relatively handy guy, but I don't have a shop, or nutrunners or anything heavy duty like that. Help! (Thanks a ton)

 

[K O]

Use a longer lever

 

[Jeremy556]

Impact gun, heat, 48in breaker, cheater bar, drill