I'm definitely not a spindling expert but I have a large collection of the things as I love them
You need to match the weight of your spindle to the fibre you are spinning. I find some are easier to use than others, for example I prefer top whorl to bottom or centre whorl, except for Turkish spindles, where the whorl is at the bottom but they are wonderful to spin. The Turkish spindle spins straight to a ball which then slips off the shaft for plying or using as singles - magic
I did learn to spin on a wheel and have three of those. Initially I believed that I would never be able to spindle, but after some brief tuition from Pete from Spindlers2 I 'got it'.
I do spin at shows and so forth, both on a wheel and with a spindle, but I also spin elsewhere with the spindle, often for sampling fleeces, or if I am walking or travelling. I find it's best to prepare your fibre into roving, then wrap it loosely around your wrist before spinning.
Don't be put off by the others' comments
you can do it, and a spindle costs about a tenth of the price of a cheap wheel. It's also even more like magic than a wheel