i must admit i used to jigsaw them in place. i was frightened the top would snap if i did it the other way. then i got brave and bought a ts55 and gave it a try. now each time i set up my trestles and a table top i made out of mdf and 3x1 pse. all biscuited together. i put the work top on that once ive done the mason mitres and trial fitted and marked the sink. then with a few offcuts underneath to support it all i use the ts55 and finish off with my jigsaw. easy.