In reply to laura howarth:
My view is that there are two distinct aspects to learning to lead and they are quite different whether they are learnt via instruction or self taught.
I would first plump for leading routes indoors at your current standard to get the habit of clipping and the mind set of being above gear and possibly falling - perhaps even practising a fall so it is not a new experience.
But the biggest step is to be able to place good protection, easily, reliably, safely and I honestly believe this is the biggest step.
For this I think you need to find lots of easy climbs with good placements and learn what fits where then repeat those routes using some of the good ones but also finding the more marginal ones.
Once you feel confident choose routes that are known for good protection and work up to your indoor standard on those. Only then I would move onto more unknown climbs where the protection might be more sparse.
As a final point I would offer the view that not everyone wants to be scared and if top-roping on the wall gives you the good feelings you want - why lead?