Why does it has to be so difficult

I have leaking coolant level sensor. I went to replace it, and cant disconnect electrical connection. It got red clip to prevent it from disconnecting, but that clip got tiny thing to hold it in place. I've almost broke it, but stopped myself in time. And while i was there i've noticed part of engine harness rubbing against radiator support. Fine i thought at least i reroute that, and feel like i've done something today. Fat chance. I needed to disconnect a plug there too, and i have no idea where to start. why why why is it so difficult

 

Success. With little more patience ( and better lighting) i've figured it out.