I've never removed the turnsignals when putting mine on or off. Yes, it is a tight fit getting it over/around the signals, but it can be done. I haven't had it on in a good while, so I don't remember exactly how I did it right now.
Sorry, but I don't have any pics with the shield on.
You could put a soft around the signals while installing the shield if you're worried about scratching it. That might help.
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC
"When life throws you curves,
Aim for the apex."