I had to re-string some blinds last year. Mine were attached to the valence with an "L" Bracket. Taking the side and top valences off can be kind of tricky.
I assume the blinds are fabric. If you want, you should just be able to run a screw through the underside of the top of the blind, into the corner of the upper and side valance. should be a nailer (block) in that corner. Should be able to just push down on the blinds to move them out of your way, if they are fabric. Just make sure you use a screw that is long enough to to the job, but short enough that you dont run it through the other side and have it polk through the valence.
[COLOR=]TV- 2010 GMC Sierra Z71 EXT. cab
TT- 2012 Starcraft Autumn Ridge235fb