I once installed a lot of large bore PVC pipe, indoors, in a confined space above a ceiling. In the beginning, it was like wrestling a greased pig. But, we quickly developed the following protocol, which made it somewhat easier to assemble.
Step-1: Mark the pipe cuts using a wrap-a-round marking guide, and cut the pipe as square as possible to ensure maximum surface adhesion of the joint.
Step-2: Using a file, grinder, or router, create a 1/4"-1/2" bevel on the end of the pipe. This bevel will make it easier to push the joint together, as well as ensuring equal distribution of the glue.
Step-3: Make alignment, and socket depth reference marks on the pipe prior to assembly. The marks will indicate when full penetration of the fitting's socket is achieved, and alignment is correct. Also, the marks will serve as a guide for applying the glue. Thus, ensuring the proper amount is applied.
Step-4: Place the pipe and fitting into position, making sure all surfaces are clean, with no burs or anything that will inhibit assembly.
Step-5: Strap two ratcheting cable come-a-longs onto opposite sides of the pipe, and pull out enough slack cable to wrap around the fitting.
Step-6: Apply liberal amounts of primer and SLOW SETTING / HEAY BODIED GLUE onto the pipe and fitting.
Step-7: Push the fitting onto the pipe as far as you can. Then, wrap the cables around the fitting and simultaneously crank the come-a-longs, evenly driving the fitting home. Let it stand for a few minutes before loosening come-a-longs, to prevent the fitting from pushing back.
Tip: Do not assemble the fittings dry, in an attempt to check your measurements. The fittings are very tight, and the friction makes it nearly impossible to separate them from the pipe.
Using heavy equipment to drive the fitting home, as vamaz suggested, is a good idea. If, you have a steady handed operator. lol
