replacing window cranks--lift moulding?

I am replacing a 39-156 crank in my home. The 4 mounting screws are under bottom moulding and hard to extract. Can i pry this moulding off and replace it after i get the crank installed ? or should i use special scrwedriver ?




thanks

I just replaced 5 of the Truth window EntryGard dual openers.
I started by carefully prying the sash off to expose the whole arm assembly.
Use caution removing it and start from the end with the rollout crank. A window that opens from the left, you would start on right side removing the sash. I used a screw driver and inserted it thru the opening where the crank handle attaches. Carefully pry it up using the metal plate as a pry board so you don't damage the wood sash.
Remove the wood sash, unscrew the 5 screws and put the new one in place.
Total time for each one took about 15 minutes. I used a small hammer and a paint stir stick on the sash to carefully replace the sash. Lightly tap on the stir stick as it lies flat on the sash to get the sash back down into its original place. I used a little white caulking to cover up the small cracks and it looks great.