FileVault -- trying to understand better

Hello,
I have sensitive data on my MacBook. I'm afraid the log-on password doesn't provide much protection. I'm hoping FileVault will relieve my worries. It's turned on now. If my machine is lost or stolen, I think it will keep my data safe.
However, if I need to get the machine repaired, I don't want to worry about a dishonest technician accessing my sensitive data and doing something bad with it. I'm wondering if FileVault can protecte me from that kind of problem.
I set up an administrative account just for technicians, gave it a different password. Then, I turned on FileVault while logged into my usual administrative account. I thought that doing so would only encrypt the user folder for that account.
When I logged out and logged back in to the technician account, the hard disk appears inaccessible from technician account. It doesn't show up on the desktop. That means a technician might not be able to work on the machine.
So, it appears that FileVault has encrypted the whole hard disk, not just the documents, libraries, etc. in my User folder.
Did I do something wrong, or is this just the way FileVault works?
I don't see any way of controlling what FileVault encrypts and doesn't encrypt. Did I overlook something?
I realize there are certain measures to keep my machine safe before I turn it over to a technician. On the other hand, if the machine becomes inoperative, I might not have the opportunity to take such measures.
Thanks in advance,
Tim

When you take it to a technician you can either keep it encrypted, erase the drive, or otherwise require they use a secondary boot drive. However, if the problem at hand is software-based then they will need access to the drive somehow.
If you have some files such as financial or medical records, then my recommendation would be to keep them sequestered in a separate folder, and then if you need to have the system serviced, either delete them or place them in an encrypted disk image. When you have the system serviced you can then be sure they will not be seen by the technician.
Unfortunately having any system serviced will require the tech to have some access. One option to prevent your passwords from being discovered is to change your user password or create a new user account for them to use. A new user password will break the link to your login keychain so they will not be able to unlock any services you use (you can mend this link later on in the Keychain Access utility).

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    Hello, Experts!
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    http://pdfdevjunkie.host.adobe.com/00_helloWorld.shtml         
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