You are quite welcome.
Yes, Micro Sol is decal solvent. If the decal will lay down well without using the decal solvent, I think I would avoid using it and stick to just warm water. The decal solvent will soften the decal and cause it to swell a bit, sometimes causing it to wrinkle. Wrinkles are usually ok, they will disappear when the decal dries, but there may be complications when layering decals. It may be perfectly OK, but I think I would play safe if you can. If you have to use solvent, I would go sparingly and 'work' the decal as little as possible.
Yes, much has changed in the last couple of decades. There seems to be so much available in the way of kits, parts, & accessories, tools & supplies, and so much information readily available in the way of tips and techniques. There is more than you can keep on top of. Kind of overwhelming at times.