First off, good for you.
If you are only doing 4x5 contact prints, you should be able to do this 'under the radar', as it were. You can take 8x10 paper and cut it into 4's or print right onto readily available 5x7. You don't need trays (and the horizontal space they require, and the potential for spills). You can use juice or milk jugs: I like the plastic jugs that hold 1qt. bags of milk.
The wattage recommended was presumably for a desk lamp one foot or so off the tabletop. Any bare bulb overhead lamp will do and you can certainly find the optimum time for exposure pretty quickly. You probably want to get an exposure time in the 10 or 20 second range. You can also get ilford contrast filters 6"x6" that you can lay over your weighting glass, but it might serve you better to strive for nice negatives from a bare tungsten bulb.
The only other thing you need is a handheld red LED flashlight (or similar), and some way to measure the increment of time.
Just to encourage you, I've done 'emergency' contact printing by popping a Vivitar flash unit in a bathroom while a cohort stood guard outside.