Replacing clip-ons

I realise it's not a kwaka but figured I would ask here to save me going to an unfamiliar forum 
I have a new set of Gilles GP lite handlebars for my Aprilia RS250. I will obviously have to remove the top yoke but I'm just wondering whether I need to undo the main bolt that goes down into the steering stem?
I will upload a picture shortly to make it a tad clearer. I'm hoping that I will be able to just undo the two pinch bolts on the top yoke and slide it up and off... but that seems waaaay to simple.

I have a new set of Gilles GP lite handlebars for my Aprilia RS250. I will obviously have to remove the top yoke but I'm just wondering whether I need to undo the main bolt that goes down into the steering stem?
I will upload a picture shortly to make it a tad clearer. I'm hoping that I will be able to just undo the two pinch bolts on the top yoke and slide it up and off... but that seems waaaay to simple.