Hi, not a pro but went through these two issues:
Q1- You should be able to access it from under the cowl, without unscrewing anything.
Beside wiper motor passenger side, try to pry the two clips and push up:
Q2- When I had this kind of trouble (one turning side didn’t disengaged when coming back to straight drive), I opened the turn signal assy and cleaned it.
A puller is required to pull out the steering wheel.
It worked some times but I finally had to replace the unit. Amazon, not too expansive.
If you go that way, my advice, buy it new. I tried the "used part" way, it concluded by a fail, it doesn’t worth the time and effort.
Be careful to order an identical unit, there are couple of "similar" out there, but won’t fit.
Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022.
Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel.