Mart makes it sound easy. My experience on my 33/34... pretty much like Mart says, but I had to remove the rear spreader / combination tire mount. Getting the 3 bolts out can be a pain if they are really rusted. And, the biggest hangup, holding my tongue just right to get the tank out. It had to be tipped 'just-right', and then the tank would come out. But, finding the 'just-right' position was a chore. Same for putting it back in.
I would also speculate that if your goal is to put in a new reproduction tank, you will likely face some problems. I envision that the repro tank (if you are using one) will not be made quite the same, and may even be impossible to install, unless you consider unbolting the body from the frame and lifting the body. Just my opinion. I have no experience with repro tanks for a 33/34. But, for later models, some tanks don't fit without lifting the body.