Welcome friend, My computer died put it's cooking again, I've cut three foot long straight lines in 3/4" white wood with a spiral no problem .I used my finger as a fence guide ,moved slow and steady ,easy as pie!Spirals cut way slower than flat blades and need to be very tight in the holders ,a high ping sound when plucked.Check often when cutting as pushing to fast will loosen them up and break on you .You'll acquire a feel for them just keep at it.Very taunt and move slow ,you'll do fine!Thanks for joining .Hope your going to be a regular here!