i use a couple of wrenches that have the closed end as a ratchet . they seem to work pretty well . ( ie ratchet wrenches ) .
you also need to remove the injector lines .
when putting the new glow plugs in , make sure you don't cross thread them , ( #1 on mine was cross threaded from a former owner ) .
when it comes to put the small screws for power bar , i don't bother with the washers , and use a piece of silver solder bent at 90 degree's , one end on the tip of the glow plug , the other gets the nut dropped onto it , then guide the nut to the tip of the glow plug , and carefully spin with a long pair of needle nose plyers till it catches the threads.
good luck , and by yourself a case of beer , and be prepared for it to take all day

.... and just be glad you don't have to change the heater core yet
