This may help:
I have both the Xbox and PC versions of both games. I don't know if it makes a big difference but it is easier using KSE when you have the PC versions installed.
As fas a saves are concerned, I learned a few things about modifying Xbox saves without having a modded Xbox:
Never attempt to add items - it will corrupt the save when you try to load it.
If you are going to change the name of the character - it has to match the original in the number of spaces that it has. For example, Zeth Kor has eight spaces - seven letters and a space. You could change that name to Zim Fett because there are still the same number of spaces.
If you decide to add a feat, you have to remove a feat. I always count the number of feats that the original save has and make sure my modified one has the exact same number of feats. The same goes for force powers.
You can change all of your attributes and stats as you wish. Keep in mind that with TSL, if your CHAR and Persuade skill is too high, your alignment can sometimes flip your companions' alignment. You can also give yourself as many credits as you'd like to have. You can do the same with Components and Chemicals in TSL. You can also set your Good/Evil (Alignment) - 0 for Dark Mastery and 100 for Light Mastery.
These are just the rules I have to follow using an unmodded Xbox. Since I only bother with Xbox Live while playing the 360, I'll be soft modding my Xbox very soon.