Hi Nixon, one option would be to simply lay the lattice flat on the ground (dirt/grass) and make your cuts. The minimal amount of dirt, etc. that your saw’s blade will pick up won’t hurt it any (as long as it’s not rocky ground). Now if you had a helper, then he/she could help support the part being cutoff so that it would be easier for you.
Hope this helps,
Wick!
Wick