Exactly. You need to melt some solder on the tip of your iron, until a large drop forms on the tip. Then you wait until all the smoke clears, since that's contamination in the solder that would cause bad joints. Then you transfer this blob of solder from the tip to your component leg, do this as fast as possible, don't let the component get hot, that might damage it. If it does not work, add more solder, or just skip the joint. Half of those components were put there to inflate the budget, anyway, so soldering half of the joints should work just fine.