I can't, I'm sorry. I understand you can't get a new computer but you're going to NEED too before you start Rom Hacking. My advice is, stop Rom Hacking for now and come back to it when you have a new computer and learn more about it. You can't just randomly ask ppl for help like you've been doing. Trust me, you gotta do things for yourself until you establish that you're a good Rom hacker. Afterwards, maybe ppl will help you out. But for now, you can't rom hack. Goodluck.
You're going to have to hack on a new computer then. Nse is one of the most important tools to rom hacking. If you can't open it, you won't be able to successfully make a good hack. You can't ask someone to insert an OW for you every time you need one. Not to mention HG/SS Sprites come with different pallete tables, if you insert them, you'll end up ruining your other OWs as well. You have to recolor each of the frames to 1 pallete color and insert them. Goodluck. Buy a new computer.