[charlescrown]

Not sure if your problem is access or it's just tight. Depending on the style of fitting I use pipe spanners or ring spanners. Sometimes a rattle gun if it's an accesible banjo fitting. Yes you will make a big mess if you start the engine with an end of the hose off.

 

[charlescrown]

Now I understand what you want to do. As long as the hose is tight at both ends the mountings which your referring to are fitted to stop vibration etc as well as support but for a short trip should be OK. Just make sure it can't rub against anything or touch the exhaust.

 

[charlescrown]

Good news. You want to try a Toyota Camry (old model). You have to kneel on the front apron panel and work down the back of the engine. They don't make some of these jobs easy.