Just a real quick question. I've noticed on the "other" forum that you are hunting for a 1/35 G-System Ex-S, and yet you are asking how to pin resin kits?
From my experience (I've built a bunch of g-system kits/resin kits) you may want to try something else before trying to tackle the Ex-S. Its a massive kit that requires a ton of work, and alot of space to display it.
I am not saying you shouldn't buy it, cause honestly its your money and you can do whatever you want with it.
I would only recommend trying some smaller kits first. The amount of paint required for that Ex-S alone is at least a few kits to practice on. I am betting you will need probably about $150 - $250 worth of paint to finish that thing. Thats not even including clear coat, or anything else.
I must have absolutely confused you with these posts. I am not a new modeller. Have been for 22 years. I have built various kits and various materials, including resins. In fact, this would be my 4th G-system kit. I have been looking for the 1/35 EX-S for a couple of years after repeatedly missing G-sys's productions... So I am really elated that I found it.
As for the pinning question, you know, the funny thing is, I have NEVER pinned my models. So when I browsed through this forum and found several mention of pinning, it got me interested, and seriously would be a good step to follow. You must also have found out that I asked the exact same question in the "other" forum.

So I hope I have clarified your doubts, and really, thanks for always looking out for over-zealous new modellers buying gigantic kits! : )