Any helpful hints on laying flex track

This will not work very well unless you are doing an "S" curve. This is because the outer rail needs to be longer than the inside rail and your track would bind up when the soldered rail joiners hit the ties as they try to reposition themselves around the curve. The way I do it is to start laying the track down and pinning it in place as I go. Peco track does not have holes in the ties like Atlas track so I use "bulletin board" type push pins where I can push them in far enough so that the shoulder of the hour glass shape rests against the top of the rail. I usually use one pin across from each other on each side to hold both rails every few inches. When I get within a few inches of the point where a new section of track needs to be joined on, I clip the longer inside rail back to the length of the outer rail. I leave enough space without ties to solder on the rail joiners and solder the new piece on leaving it straight so the joint in the rails is not kinked. Then I bend the few inches of track on the curved section into place and continue on with the new section. I pin them down as I go. You can either lay a bead of glue down on the road bed first before laying the track or squirt some glue down between the ties after things are pinned in place.