Modern Vespa

I wanted to get some guidance on replacing 14 and 7 in the diagram for 2005 GT200. It's currently making noise, I believe I didn't tighten up enough when I worked in that area, and now the nut (10) is showing wear from moving back and forth and the spacer (14) looks damaged. I thought while there, I would also replace the bearing (7).

Is this repair fairly simple? is the spacer and bearing pressed in? Also in the diagram, a little confused if the shock has to be moved out of the way?

please let me know if you need more information. I used a torque wrench last time on the nut (10) to 88ft/lb as spec. The guy at the shop say that nut has to be replace everytime if it's been removed, is this true? TIA.
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Hardest part will be removing the rear wheel and exhaust. Once the swingarm is off, it's pretty easy to replace the bearing. Search the forum on this. I use a long bolt mounted perpendicular to a bench vise as a home made bearing press to install the new bearing. Set the bearing in the freezer for a couple of hours and the swingarm in the hot sun. Use another bearing and a fender washer, or a socket and a fender waher (that is larger than the bearing diameter) and tighten a nut down on the bolt to get your bearing to press in.

You have a cotter pin running through the axle and nut. I've never replaced the nut when I change a rear tire.

the wheel and exhaust is easy for me, but I have never removed the swing arm before. I do have pin in the cap but there's a little wiggle in it, I bought new cap, nut and pin, spacer, bearing, so i hope to get it all fixed.

thanks for the suggesting.

The castellated rear axle nut gets re-used for the life of the bike. Your mechanic friend is full of BS - unless he thought you were talking about the variator nut. *That* should be replaced every time according to the manual with its integral belleville washer.

I have to do them every so often when they get so rusted on that yanking them off damages the bearing.

Get a big ole hammer and wack the old bearing out with something then find a socket just slightly smaller than the new bearing and wack it back into place. Remember to only hammer on the outside edge of the new bearing.