if you can draw a heart...you can do this!
Have you seen these awesome water-based Sharpies? I found them at JoAnn's, by accident when i was looking for traditional Sharpies. I was so excited and i knew exactly what i was going to do with them!!!
If you absolutely cannot draw a heart, you could always use a stencil, or trace the cardboard ones that you can buy at any craft store. Then, just turn them different directions and embellish them a little with polka dots, stripes, arrows, scallops, etc... if you mess up, simply wipe it off and start over. easy peasy.
doodle away, my friends!