If your fabric is washable then be sure to wash it FIRST before you cut anything. The georgette or the lining may shrink in different amounts. Try it on again after washing and then decide where or if it needs cutting off. Stitch 1/4 inch longer than you think you need then cut below the stitching line. The stitching will give you some stabilization as you do the hemming. Practice on the part that you have cut off until you are comfortable as possible then damn the torpedos, full speed ahead. Good luck and best wishes to the happy couple.