FleetTracker

You'll be fine powering on the cable. Just have someone hold the new cable spool tightly with a long screwdriver through the spool and apply some resistance. I've done it 6 times without issue.

2 people helps re-spooling. Loosen the clutch knob. Pull all the old cable off manually. Remove clutch knob assembly. Take the spool off the shaft. Cut the old cable crimp off and remove. Put new cable through boom-end Pulley (don't forget this step), thread new cable through the hole in the spool and re-crimp the end. Re-install spool on the shaft and align line counter gears. Either use the dc motor to spool it back on or use your back-up manual crank handle. Helps having 2 people at the end to provide good resistance on the new spool of cable to wind it on the tightly. Then re-terminate the end of your new cable.

I tend to be a bit conservative when I fish. I'll take the extra 30-60 seconds deploying vs. The nightmare of a tangle.

https://youtu.be/9UmYyUK2ns0

Another consideration: how aggressive are you trolling with the boat with these deployed? Do you take sharp turns? You aren't as agile as you may think out there... take wider swooping turns and see how you make out. Still could be too aggressive let out...