Our fees are based on the difficulty of what you require, and are negotiable.  Our general policy is to require payment up front, but on occassion we have been willing to work out agreements for half pay up front, followed by full payment once the deed has been done.  If we cannot complete your  task we will return your payment in full.  We also don't take kindly to being stiffed, and doing so may end up costing you a great deal more in the long run, if you catch my drift.