You don't need a chainwhip to tighten the cog, only to remove it. When you first get the and bike assemble it, place the front wheel against a solid object like a brick wall and stand on the forward pedal. This will tighten the cog better than any chainwhip ever could. Next, remove the rear wheel and tighten the lockring using a lockring tool. The lockring has left hand threads so it tightens counter-clockwise. Reinstall the rear wheel and adjust the chain so it has a very slight bit of slack at its tightest position.

Let me caution you that the bike will arrive with the wheels out of true and the hub bearings set too tight. You need cone (thin) wrenches to adjust the hub bearings. Also, the cranks need to be tightened to about 33 ft-lbs, which cannot be done with a small hex (allen) wrench. So, if you don't want the bike to fall apart on you in short order, and don't have the proper tools or knowledge, then I'd recommend paying your lbs to do this for you.

Finally, if you do take it to the lbs, have them switch the brake caliper from the rear to the front. They will use a longer mounting bolt to adapt the caliper to the fork.

I just bought a Motobecane Messenger, which is very similar to the Windsor Hour, and with the exception of the pedals, the frame and components are decent quality and you shouldn't have any problems with yours, provided you adjust and tighten things properly. Finally keep your chain clean and lubed.