Every client is important but you must get things sorted from the outset of any project. Be clear about what has to be done and discuss further if you want to add to the project
Tradesman should provide you a guideline to the costs of the project / clearance as it essential you are happy with the work at the end of the day
Working for many years now in the Clearance Industry I can honestly say I have a 99% satisfaction rate with my clients.
If there is any difficulties with the clearance it is always about communication but get the job done to a high standard and there will rarely give any room for people to complain
Complaints can be good as it will show you are not keeping to the usual high standard but get people to read the terms & Conditions on your web site if they have any doubts