Keith,
It really doesn't take all that long to pull the engine from a Quietline. Along with your markers, bags boxes, etc., you should also have a pair of short jack stands a small jack and something that you can use to lift the engine and move it out of the way. I used a Come-A-Long and, once lifted from the tractor, set the engine on my piano dolly and rolled out of the way. I needed some wood blocking to make that happen. You also need a couple of 9/16", 1/2" and 7/16" combination wrenches, a good socket set with these sizes in it, a good flat screw driver, pliers and other tools that you won't think about until you need them. I hope your engine has a lifting eye mounted to it.
If you follow the steps in the service manual in order, it won't take that long to get the controls removed, unhook the throttle, choke rods and ignition wires, remove the hood and front grill section, and firewall/gas tank. You will have some hydraulic issues to deal with and you will have to pull the drive shaft.
I can't emphasize enough to take things in order from the IH Service Manual, found in the manual section of this forum. It is laid out very well.
From there, you need to get the modification done to the engine/frame mounting rails. Instructions for this are in Charlie's FAQs. I had a welding shop do mine, and that took a couple of days.
While you have the engine out, you may want to tighten the front axle carrier to improve your steering, if it needs it.
I figured four hours to fix the steering. I also overhauled the steering box, but really didn't need to do it.
I would think that eight to ten hours to remove the engine, pull the engine mounts make a pan template, and take the engine frame rails to a welding shop for modification, clean the frame and get it so the front axle will take grease at the pivit points and re-assemble with new ISO mounts. Before replacing the drive shaft, I would also recommend changing the flex joints and cooling fan for the Hydrostatic charge pump.
I know that you have a grand daughter who needs a ride. Once these repairs are done, it will be a lot easier to handle this wonderful tractor.
Good luck. We are all here for your questions. This job seems like a lot of work, but when it is broken down into segments, it isn't bad at all. I did this very job last summer, and almost everyone here was helpful, patient, understanding and supportive. They answered my questions, no matter how simple or stupid they seemed. Looking back, it was pretty fun.
Be well.
Brian Wittman