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Hi and welcome. Give us some idea of your present skills and you will be able to get more detailed help.
Do you know how to solder correctly?
How about using a voltmeter?
Sounds like you need a few safety pointers too, which a TV repair book may skip, by assuming you've been working on electronics before.
On most sets, the high voltage can give you a nasty shock, but generally not fatal.
The B+ power supply can be worse, even though its a few hundred volts instead of 20,000, it has more continuous power behind it. The AC line voltage itself is the most deadly aspect of any line-powered device.
Most work other than measuring and adjusting will be with power disconnected, but you still need to beware of stored charge on the CRT and sometimes in the power supply. Learn how to discharge and ground dangerous spots.
Some sets have a "hot chassis" that connects the chassis to one side of the power line. These are especially dangerous to work on in case they are plugged in the wrong way. They can be plugged into an isolation transformer, which decreases the danger of getting a shock from the chassis.
When a receiver is powered up (and in general) learn to work with one hand, and keep the other hand in your pocket. This prevents getting a shock across the chest, which is the most dangerous and potentially lethal.
Nothing about this should scare you away, just learn to work safely on an enjoyable hobby.
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