Gear shift adjustments I recently had to replace the shifters on my bike. The replacement was easy enough, but now when I shift the derailleur either jumps too far or too short. I've tried using the adjustment screws on the derailleurs but I feel like I am doing something wrong. I think I'm just going to disconnect everything and I was looking for a guide to do this properly. 

Also I don't have a rack to hang the bike while I work so I will be working on the bike upsidedown. 

Edit: Yes I have the right shifters. They are the same exact model as the ones i replaced.
Congratulations on starting to do your own repairs. The first step is realizing some thing is wrong (you seem to have got that one). Step two try to fix it. Step three learn why step two didn't work. I use the Parktool BigBlue Book as my guide. I bought mine at a local bookstore but it is available on their website for free. 

As for not having a repair stand, I installed two large hooks about six feet apart in the ceiling of my storage area. A piece of rope, nylon luggage strap or cord loops over the nose of the seat and over the hook. A second piece is laced around the headset to the second hook. I can adjust the lengths to vary the height, shorter if I'm working on a brake caliper, longer if I'm working on a brake lever.