I guess you have to have size and all that figured out before inserting the code eh?
The size of the slider is determined when you build it in the Wow-Slider software. I didn't go much into detail on that as the tutorial was about how to add the slider once its completed to a RLMP framework.
Can you adjust it once it's in?
Yes you can but not through the RLMP. All you would do is open your wow slider software and in the settings you can change to size and many other things. Re-publish the slider and go through the same steps by replacing the body section of your code and uploading the engine and data files again.
Or just adjust it's position?
This is a tricky one. In the current version of RLMP you are limited to adjusting the position after you have exported your framework, that is unless you know how to code
I am guessing that the RSD will be a much better fit for re-adjusting position after the fact.
I've heard talk about padding and margins...can those be adjusted easily once wow is in?
Padding and Margins can be set after the fact! These are styles in the RLMP and any style can be altered without loosing content. I believe Adam made a video of this, I will see if i can find it.