Yes, there are two ways.
If you were smart when buying your trailer, you would pay the extra few hundred dollars and get the side escape door allowing the drivers door to swing open as it normally would, allowing you to get out normally. This is what my next trailer will have!
In the case of my trailer above, that little door never even crossed my mind. It hit me when I put the car in for the first time!
In answer to your question, yes, I have someone hold the door open as far as it will go without hitting the wall, then I slither (pun intended!
) out the opening that remains. It does still require the window staying open and standing on the seat to get out (I always drive into the trailer in my sock feet so that when it is time to get out, my shoes are already off).
Hope that helps!
Robert