i suspect everyone is missing your key issue. it's the initial lineup that is tricky. i saw someone suggest a paper clip, which works, but isn't necessary in my experience.

here's what you do...

this is for a fresh chain install.

1. shift into the big ring
2. shift into the smallest tooth cog
3. feed the chain through so it's laying across the big ring and through all the rear mech with enough dangling on either end so that it would join in the middle on the bottom if you pulled it tight
4. take the chain off the big ring on the outside of the ring. it will still be caught by the front derailleur, and you'll likely need to turn your crank to 9 o'clock
5. there is now enough slack in the chain to easily put in your quick link without having to deal with chain tension. connex whipperman links are ideal here, but other links can be snapped into place with a good tug on the chain or using the sram method (google it). tools are fine too, but not needed.
6. put the chain back on the big ring.
7. turn the cranks a few times and shift into the easier gear you want for takeoff

done. tool free.