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· Plain ole user
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You should not have to change 6 resistors. They only need to be changed if the values are different in the kit or they are open. Most sets require no more than a couple of resistors, if that.

You do not need to remove the entire board. You can stand the entire chassis up on the front edge once you loosen a few wires. The large device you describe is the high voltage transformer, aka flyback, and it does not need to be removed. Taking the wires out is a challenge and if you don't get them seated or if you break a clip on the end you will have a much more costly repair. Leave it alone.
 

· Plain ole user
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A few of the sets have slightly different values in the kits than found in the sets originally for one or more of the resistors. Most are the same, and the original values still work. The resistors should always be checked and compared to the value in the kit for your set IF there is a kit for your set. The .pdf files for most of the Hitachi kits may be found at the link above, and they should be used for reference. As noted in the convergence repair thread, any damaged or open resistors should be changed, or any that have an updated value should be changed.
 

· Plain ole user
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In post number two, I linked you to the post on buying the parts. In that thread are .pdf files of the service bulletins that come with the kits. There is no specific mention of your chassis and your set, so assume that the original values should be used. Verify the values in the service manual. Don't make it more complicated than it is. If there is not specific info that says change the parts to a different value, the original values should be fine. Changing parts that are not necessary is just asking for problems, either by making a mistake in value or in desoldering/soldering. Verify your values and your work by double or triple checking them.

Be sure to get all of the wires back where they were, both in terms of connections and routing.
 

· Plain ole user
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lcaillo already said that you only need to replace defective resistor if any. STK394-160E is a direct replacement of STK392-110, aka, no resistor needs to be replaced unless defective.
That may or may not be true. It is for Hitachis, but there may be differences in the muting circuit that is not a problem in the hitachi sets. Sanyo never published a datasheet on the -160 so we really don't know if there are differences or not. I have heard of some other brands that have had problems using this sub. There may also be other reasons that they muight change resistors, like learning that a particular value allows for more efficient operation in some way. I don't know, but I never assume anything and I always check.

The bottom line is, assume nothing, check everything. Then verify it again.
 

· Plain ole user
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The correct answer to most questions is "it depends." I even once had this as my signature. When you make sweeping assumptions and generalizations, you are almost always going to be proven wrong at some point. Especially in this industry.
 
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