Saw on another post - you were still having problems shaving - especially behind the ears. I get this, too.
First of all - be careful. I've been shaving for 70 days in a row. And still before each shave I still mutter to myself "be careful"
Take long passes from front to back. Start at the top and work your way down - just like you see those cricket lawnmower guys who do strips. As you reach the ears, take half crescent passes around the ears.
Now lather up again, and do back to front going against the grain. Again start with curved little half crescent motion around the ears.
Don't worry about leaving fuzzy bits behind. No one else will notice with them.
Nicks tend to occur when your razor makes contact - so place razor gently on your head, the move it.
Rinse the razor after almost every pass.
And last of all - be careful.