Using the Birdingpal resources you must agree to the following: If you contact a local Birdingpal and make arrangement to go birding, you should note it is common courtesy to make sure you show up for the appointment. If for any reason you are unable to do this, the least you must do is contacting the local Pal right away.
Please note that most Birdingpals are serious birdwatchers. It is a privilege to contact them, and your message should reflect it. A local Pal does not get paid, but should he/she offer to take you out birding, using their own vehicle, it would be courteous to pay for the fuel. A lunch and/or a small gift would also be appropriate, something as simple as a souvenir of your country, or a pin from your local birding club.
Hong Kong is not all skyscrapers and bright lights! There is really excellent opportunity to see both migratory and resident species to add to your life list. My wife and I are strictly amateurs, but won't pass up an opportunity to share our knowledge and hopefully learn from others as well. We have some basic photography equipment/skills and relatively good knowledge of the hotspots. We'd be happy to try and accomodate your specific requests or take you out on one of our forays.
If you contact a professional Birdingpal guide you must be prepared to pay a fee for guiding services.