Hello greedy kite - as you can see, I am sudokulover on here!
Try to get answers for most of the clues before you start putting any in the grids.
Start with the 12letter words and fit them in the left grid. 50%chance of getting them in correct positions first time. Similarly with the 13 letter words in the right hand grid.
Most of the words then seem to slot in easily. In each grid you need an A,a B etc, so there is no ambiguity fitting the words in.
Have fun!