My usual approach is to replace all electrolytic and paper capacitors, clean the controls, check tubes, and then see where you stand. I usually leave mica caps alone unless I have a specific reason to suspect one; they are generally more reliable.
Carbon composition resistors tend to drift upward in value with age. Those with high values (1 meg and over) tend to drift more. I usually check the high-value resistors and replace as needed, and ignore the rest unless I have some reason to suspect one.
Not every old TV needs to be aligned, unless somebody messed with it in the past, or you unnecessarily replaced a lot of small-value mica caps and resistors. If it plays and tunes well after the above treatment, you're home free.
This article gives basic information about replacing capacitors in old TVs and radios:
http://antiqueradio.org/recap.htm .
Have fun!
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html