Resin kits require more skill than you're regular gundam snap plastic kit, it needs to be test fitted, cleaned, filled, sand, etc, I've never built a SHE kit, but read a little bit about them and some drilling may be require for screwing articulation and joints, it's not an easy fit, I haven't seen a SHE kit build up of a YF-19 anywhere, there's a SHE VF-4G around that you could use as a bit of reference point as to how a SHE kit works, all SHE original kits come complete with everything you need except your basic tools, never seen either a recast of this kit
I can only imagine you pay a very hefty price for this, I would recommend you search for a lot of 'tips' treads around here that will show you how to work with resin and try getting a cheapo resin kit of whatever to practice a LOT with it before you move to this, just to resume
1. carefully pry away parts from the trees with the correct tools
2. test fit part
3. drill where it's needed
4. wash the parts to remove excess flash
5. prime, putty, sand
6. paint
7. clear coat to protect from scratches on transformation
8. details
hope it helps