Timing chain tensioners 95 Altima KA

[pawndave]

OK, so i was going to replace my timing chain due to the clinking noise, which i am told that it is probably my tensioner(s). I need to know a few things befor i continue, what do i need to take off to get to the botton tensioner? Do i need to worry about the #1 cylinder being TDC since im not removing the chain? And if so, how do i keep the bottom pully from turning while taking the 27mm bolt off? Do i need to remove the oil pan etc.... I have heard that only the one motor mount needs to come off, is this true? This engine is sideways and there isnt much room to work with. Does the AC pump need to be removed? All the pullys? Thanks for the help.