Pulling motor

Pulling a 318 from a 68 Cuda to replace the freeze plugs with Brass ones. The car has to stay stationary so and I only want to pull the motor one weekend and replace it the following weekend. I am asking for tips or issues to know ahead of time. I've pulled a motor or two about 20+ years ago but not to much memory to detail especially when it comes to pulling and leaving the trans in the car. is the transmission going to leak ? does it have to be supported? does anything need to be replaced on the transmission when its out? What should I try to do a few days before that might give me a problem prior to removal? Again its not difficult being only about 20 bolts and its out but memory is vague. Thanks again for any info.