Merging Two Images Together Seamlessly In Photoshop

So now i have found out how to create my main image on a DSLR but i know that i need to take two images and merge them together as otherwise i would have to get the person that i am focussing on in the main image to stand very still because the shutter speed will be 1 second for example

Tutorials:

http://www.photoshop911.com/masking_channels/layer_masking.html


I then found something called Vector Masking by this tutorial and if i take two images one with the shutter speed open so i get the car lights blurred across the background and then another image with my model in the same background, but with the shutter speed lowered to get a clear picture and then with this tool i should be able to either use the Magic Wand tool to remove the background completly or use Vector Masking to fade the two images together


http://psd.tutsplus.com/tutorials/tools-tips/vector-masks-photoshop/