If the VX has never had A/C, it will take a lot of work installing all the A/C lines, condenser, compressor and evaporator. My current 92 VX had A/C but the compressor was taken out well before I bought it in 2005 (probably because it didn't work any more). I bought a used compressor and installed it myself. It was still difficult because all the o-rings needed to be replaced for the conversion from R-12 to R-134a and I needed to buy tools I didn't have - a vacuum pump for $100 and manifold gauge for $30. You can do it if you have the time and $$$$ but be sure to inspect the liquid lines (they're the thin aluminum pipes) carefully for leaks before charging with R-134a. I had a liquid line that had a tiny pin hole in it from corrosion that I didn't spot because it was underneath the insulation that covers the line. I needed to replace it after I had already worked on the A/C in April 2006. The repair was done later in August 2006 and that was really difficult to do in the 90+ heat.
If you can, get an A/C system out of a 94 or 95 civic. The condensor and compressor are not interchangeable for the R-12 (92 & 93 Civic) and R-134a (94 & 95 Civic) systems BTW.
You can do it. I would suggest you hook up with someone who is maybe already removing one, because of weight.
What I did was to go the pick a part yard, when they had a 50% off sale. Then I found a Honda of the years I was looking for and pulled all of my parts off of that car. When you install it, I would recommend putting in new o-rings and new oil, for R134. You can use R134 in an R12 system, but you would be better served if you got the parts off of a car that has R134 on it.
When you find a car, check to see if the system still has a little gas. If it does, then you should be good to pull them off and put them in your car. When your done, you will need something to either pull a vacume on the system, or take it to a shop to have done.
The 87 Honda I added A/C to works great. The 89 is still waiting for me to get to putting it in.