If this is your first try at this, I
highly recommend you find some light wood, preferably of the same species, and practice on it. You don't want to mess with the body until you
know what's going to happen.
Wetting the body will always look darker. It's not that it is, it's just how the light is refracted/reflected. When you first dye it, it's gonna be dark. It'll lighten up as the solvent boils off. When you add finish, it'll tend to stay darker.
For instance, here's a swipe on a Mahogany body of absolutely clear Naphtha...
Not a finish, just the solvent. It evaporated almost immediately and you couldn't tell it was ever there. The same thing will happen when you start shooting clear coats over your stain.
Here's that same body after it's been finished with nothing but clear lacquer...
This is why you want to practice on something. Even if you have to get to a lumber yard to get some test pieces, it's worth the time/expense because it's tough to tell how things will turn out. Hate to have to strip/refinish a body. That's no fun at all.
If you can get a chunk of Alder, stain it, then shoot some clear on it, you'll know what to expect and can adjust as necessary before you start terrorizing an innocent (and expensive) body.