Lol... I missed the 233k then had a good chuckle! You say you don't have the knowledge, tools or skill to do the job, then label it as a simple thing to do!?!? More enjoyment, but you're right, it is a simple job, but probably not what you need.
My opinion is your tranny is showing signs of wear... Yeah, sure, it may have been well maintained, but the proof is in the pudding! You'll do something you think will help resolve your issue, only to discover in another 5 or 10k it masked the real problem. Then you'll be pissed at the time and $ spent, wasted, that could've been better spent.
Now, if it was YOUR tranny for the entire 233k and you said it was well maintained, then I'd say, ok, go for it. Bottom line is you have no idea how the car was driven. Between filter, fluid, shift kit, I'd put that $100+ towards a new rebuild : ) or consider it 1/2 the shipping of a TEP tranny... Lol
But that's just me... And Anthony hit the nail on the head, the shift kit you're thinking of is the simple one that'll just quicken the hard shifts.
Good luck!
