I want to replace the curvy piece the spring is connected to.

Sigh i am kicking myself int he butt right now... the paint got scratched and stuff. Indeed a steep learning curve.
So i guess i'll buy a whole lower hinge, cause that thing just doesn't want to come out.
So, once i take off the fender, i loosen all the bolts on the hinge to door, then i take off the lower hinge, replace it, align the hinge to body to where the paint is darker, tighten that fully? or slightly? then while the door is closed and someone is pulling the end of the door up, i slowly tighten the bolts one by one, then put the fender back on? and see if it opens and closes and still clears the fender? and lines up with the lines?
I found this article but its still pretty ambigous
http://www.hotrod.com/howto/hdrp_0609_panel_alignment/photo_01.html
Sorry for the noviceness
Edit: I actually was snooping around google and under one of the google books i saw some info, ends up i have that book. So i checked in it. These are the steps I read in that combined with some of barn stang's advice; let me know if it makes sense
1. take off front fender (mark the original positions of the fender to the inner apron of the engine compartment) and measure the distance from the body to the exterior of the fender/door area ( the height of the body lines).
2. Replace the entire lower door hinge (don't want this whole operation to go to waste or have to redo it again down the road) and do so by lining up exactly where the old hinge wasn't painted, the outline. and tighten the bolts to body fully down
3. attach the door in a not too loose but not too tight fashion, but enough to close the door,
4. have someone pick up the door by the handle, and place paint stir sticks on the bottom between the door and the rocker panel and between the door the rear fender to help improve gaping.
5. try to center the bolt holes on the doors with that of bolt holes on the hinges. At times using a screw driver to push between the hinge and the bolt hole propping and centering it in place.
6. thread other bolts (this is the part where i kinda get confused. How tight should i thread these bolts? fully? since the paint sticks are helping to gap would that be safe to do?)
7. using previous measurements make sure the depth from the body is correct (so it'd be as deep as the fender is) [if its too far out or in then ever so slightly loosed the bolts and either push or pull till the right depth, then re tighten]
8. remove paint sticks and open and close to see if the door position stays
9. place masking tape over the end of the door to prevent further scratching (Sigh)
10. replace the fender aligned to previous specs.
11. slowly open the door to see if any rubbing occurs (what should i do if it does? pull the fender further up?)
12. Tighten all the bolts on the fender fully and done?!
13. take it to a detailer to touch up the already messed up paint.
14. enjoy it and never mess with the doors again.