yes, it can help to look up a tutorial to see how it's done. Just to reiterate, leave the xbox lid off, connect the molex splitter and have both drives receiving power. From there, power on the Xbox and navigate to your applications folder. If you have not yet, transfter the latest version of CHIMP over (chimp 2618 I think?) and also put it in the root directory of your partitions app folder. For example, you should have E:/Apps/Chimp and also have the contents of the Chimp application in the E:/ folder. It's only a few specific files it needs but I can't honestly recall which ones, so might as well put them all in the root directory.
After you start up chimp, move the d-pad to the left or right, as there's an automatic count-down timer that will select the default option which is a bit annoying. Moving the cursor negates it. From there, carefully remove the IDE cable from the DVD drive and attach it to the new hard drive. I should have clarified earlier, make sure the new hard drive is set to the "slave" setting on the jumpers. There's to my knowledge, always a diagram showing what this may be on your hard drive.
After this run the FAT option on the chimp main menu. From this, scan the IDE devices, it should show you hda and hdb presenting (look for the drive brand names.) After this clone the master drive to the slave drive, and the process should take no more than 10 minutes. Lock the slave drive from the motherboard (use the analog stick to select things) and after this is all done, shut down your system, swap the drives and enjoy.
You may want to readjust your partition sizes, you can use an application called Xbpartitioner 1.3 to do this, it's a bit picky, but all you need to do is format it once the way you want it. (for example, if you have a 400GB drive), it should present it like this: F:/ 360GB. Then reformat it again as it was originally, typically its F:/120GB and G:240GB, then format it one LAST time as F:/ 360GB. It's picky, and a bit annoying, but it should work perfectly after this.
better on Xbox.
I haven't seen any documentation covering the results of forcing resolutions, but doesn't republic commando have a 3D hud? I think it may run fine. It's not hard to experiment with at least. Just bear in mind you're stressing the hardware more so it may run worse.