Every lawyer who acts for a party, must enter into a cost agreement. This is full disclosure to a client of the fees that a lawyer will charge including outlays that may be incurred on your behalf. This is discussed with the client prior to any work being undertaken.
Some lawyers charge on an hourly basis for the work done. The hourly rate may vary. Some lawyers choose to charge you on a scale they have prepared and attached to the cost agreement. The scale may be similar to the cost scale under the Supreme Court but on a higher rate and with more items for services set out in their cost agreement. It is difficult to ascertain whether the scale charge in fact is higher than an hourly rate at the end of the until the matter is finalise. However, on my experience, it does generally work out to be a higher fee.
Lawyers do not take a percentage of your damages.