I agree with jayrod and phamENG.
Say you use truss software to determine tension/compression loads. Are you capable of determining the buckling capacity of those chords? Do you know how to determine visual grade, or are they mechanically graded? Bracing evaluation of the compression chords will change when you change the shape and loading throughout the truss.
Do you plan to live in this house for the rest of your life? Do your kids plan to keep the house forever? What happens when you try to sell it? A home inspector should catch this floor modification, what happens then? Home lenders are not particularly keen on underwriting loans to non-permitted structural modifications. Then what, deal with the county inspector when it comes up? This assumes the truss hasn't fallen down.
Hire a licensed engineer experienced in truss design. Let them perform the work as they are skilled in understanding the issues that can come up. Trusses are not directly code approved structural elements. As such, they require stamped calculations to validate capacities and design.
Edit: spelling mistakes.