breaker_bar

I'm a newbie to these forums and hope to build a hill climber and possbly race.

i've a 2005 Mazda 3 that i purchased a few months ago, replaced struts all around, pulley, thermostat, added a skid plate.

Looking at the crankcase breather hose, i can't figure out how to disconnet the hose from the intake and crankcase without breaking the plastic fittings. I've already broke some other plastic parts which I replaced.

I'd appreciate any advice and looking foward to providing the same for the past work I've done.