Don't worry about the scuffs, think about it in a positive light, the 1st scratch has occurred now you needen't worry about avoiding it. Fresh pedals and minty fresh shoes look dorkey anyway, of all the parts on a bike, these parts should show some use, same goes for bar tape!
As for clipping in and out, well 1st thing, set the tension to minimum at 1st, refer to the manual for this. It will reduce the effort to clip in and out until you get used to it, then you can increase the tension to a level where you can't accidently pull out.
Then go practice in a park or something, take the shoes with you in your bag, you can ride on spd-sl or Look style road pedals with trainers easily for short trips (I have done it plenty times) to get to somewhere quiet.
Remember, you need to kind of clip in with a forward and down motion rather then just pushing down. The pedal is weighted to hang in a way that lets you clip in easily. Notice it hangs with the front loop aimed up, thats so when you step into it with a forward motion the cleat slips into the locking mechanism, the pedal then rotates and the rear of the cleat clicks into the mechanism at the back of the pedal.
It is a bit wierd at 1st but it becomes pretty easy.
Some tips, before stopping, drop into a gear in which you can get some momentum from one pedal stroke so when you set off you can get moving easier. If you are in to hard a gear you wont accelerate enough to get much momentum (okay on quiet roads but if you have traffic behind you might get a bit stressed rolling along very slowly clipping in) It will also allow you to soft pedal in an unclipped state until it is safe to try again if you missed 1st time round. If you are in too hard a gear you will struggle to apply pressure with the unclipped foot.