You should find some useful information about both the 135/3.5 and 200/4 here:
https://www.pentaxforums.com/forums/114-maintenance-repair-articles/179884-pe...-database.html
For a method of getting the vanity ring off the front look at a series of posts I had here a couple weeks back. The OP gave some great advice.
A camera shop told me the tool to use for unscrewing the slotted rings around glass etc is a micrometer - cheaper than a lens spanner. Get a metal one.
The Takumar lenses have both straight screw heads and some cross heads. The cross heads are JIS standard, not Philips. A Phillips driver in a JIS screw will strip the screw head.
Tweezers, like the ones Focusingscreen ship with their screens are very useful for holding screws to position them properly.