Camshaft sprockets removal instructions

Which diagram should I be looking at? I've had this belt off and back on five times today and I don't see anyway of keeping these from moving if but just one tooth enough to mess things up.

Yes I know, I don't know why he felt I needed to refer to the photos. I know the problem I just need the tool to hold these gears from moving it's just that simple.
For some reason one side wants to move before I get everything lined up and locked down.

There's no slack in the belt now. But I'm still of a tooth off and every time I take the tension out of the belt and try to turn the cam back or forward a tooth it's not loose enough. So I take the whole belt back off and right back to square one. I'm going to Harbor Freight and try to find the right kind of tool to fit this thing I don't have a clue what I'm looking at. But have no help I mean physically help to hold a socket on it while I do the belt

That's something I watched this same video four times today. And you see how he has two ratchets one on each cam gear? I suspect there is a trick to it or someone held the ratchets while he installs the belt I don't remember. But there's also a video of a guy using the tool I'm talking about in a demo of a dual cam motor timing belt change. I'll go back watch the video again maybe I missed something but this has been a nightmare. Two more hands I could do it.

Yes, I made the mistake of putting a wedge of wood in front the gears and like to have never got them out. I have been bent over this thing like ten hours. And it starts but when I turn it off and align the timing by hand and a ratchet on the crank when I rotate by hand back to the marks it's usually the intake camshaft is out by a tooth. Every time so it's hard starting.

Very true.

I'm almost 70 years old so it takes me a while in the mornings but I'll get at it in a bit. And I can't tell you how much I appreciate all your help and what a great job you guys do and to take your time on the weekend to respond to these questions really shows your commitment to your work and this site as well. Great job thank you again and I will let you know how things go today.
I'm going to try again and if I have no luck I'll look for the cam tool. Have a great day. JC

I got a question for you.
When bringing your cam gears upon the backing plate marks if you aren't very careful the gear will jump forward past the mark and you hear a loud click. Why is that? I'm guessing it's an indication the valve or valves have either opened or closed. And when your marks are aligned properly in what position are the valves under the cylinder? My son is coming all the way across the state from East coast today to hold the ratchet for me. I hated to ask him to do that but I live deep in the country pretty isolated so it's really my only option. I really hope this works and that this is the problem. It ran fine when I parked it and decided to change the belt. The bad thing is the belt looked fine but I didn't like the looks of the tensioner. Okay, thank you.

Gotcha just wanted to make sure. Got everything lined up perfect waiting on my son. Everything has to be just perfect I can see that now there's no room for error at all, but I think with another pair of hands I'll be okay.
I rebuilt my Nissan hard body last year whole engine with no trouble.