Just try them out, using the advice given already! I've been using toe clips/straps since the early '70s, with either non cleated riding shoes (Avocet Mod. 30) or cleated (Detto Pietros with TA Anquetil nailed on cleats or Diadoras with bolt on cleats).

As mentioned previously, never, ever tuck the straps into the buckles! I made this mistake the first time using my Dettos in town, came up to a stoplight and couldn't get my foot out! Fortunately, I was right by a telephone pole so used it to stay upright while extricating the strap ends. When I ride toe clips/straps anymore I normally do not tighten them. I also ride clipless, and lately mountain bike-type flat pedals with the pins. If you can't get used to toe clips/straps, just use flat pedals. No one will care.