well just to let u guys know after some serious head scratching

finally got the blazer started.battery as i said b4 was deader than dead so replaced that but it wouldnt start .........she was turning over but not firing so we checked the plugs etc and finally had to really clean up the distributer up as all the pegs were severly corroded and after all the cleaning she started at first turn yippppppeeeeeeeee.
so know my freind has to replace plugs leads and distrbuter and arm but my 1 question now is and it may sound dumb but how the hell do u get to all the plugs

. we managed to get three out but couldnt get all of them esppecially the ones on the side of the engine that has the steering colum running next to it ..................is there some sort of trick to do or special tool to use ..............plz plz help as im trying help my freind out from having to spend a fortune to get them changed..................also wat is ussually done on a 100 thou mile service .
many thanks for ur help