well i don't know if hoodoo doesn't backfire or not, all spells carry the potential of backfiring, or at the least not working, for many different reasons. love spells are tricky though, and it can be classified as "black magick" since many love spells are used to force someone to fall in love with the caster unwillingly. if you're planning on casting this type of spell, be warned, you will feel some negative karma coming your way. also, spells ware off, and love spells have to also deal with the person subconsciously fighting against it. so a spell might ware off in a day, or ten years, it all depends. if i were you i'd research, and meditate on the issue, before casting a love spell. if you wanted to cast a simple one to attract love into your life though, lighting a pink or red candle while visualizing yourself with someone [but not a specific person] that would be ok, since you're not casting over someone, you're sending the energy out to bring someone to you.
if you cast be sure to be proactive, don't sit around waiting for something to happen, talk to new people, go to social events, that sort of thing.