The tricky part is often convincing a client that pre-planning is a necessary part if the process and, though it is billable time, will ultimately save money. Many client don't appreciate that programming is not just writing code.

Also you can wind up meeting and planning yourself right out of a gig sometimes - which is fine if the gig wasn't truly necessary. But can be bad for your business if you spend hundreds of hours doing this for no compensation. This is a real situation that happens - you get a client that wants a big project and after many meeting and calls you determine that a Wordpress install will suit them perfectly. Their network guy does the install and for all the money you saved them your reward is that you don't get the gig!