Installation isn't that difficult, but if you're not comfortable with a little DIY plumbing, yes, it may be an idea to get someone with experience to help you out.
With regard to hookup, there's just about any fitting/adapter imaginable available to hook one of these up almost anywhere. Definitely need a drain or very large container for the waste water. Most of these units produce 4 gallons of waste water for every gallon of pure water, so your 8 gallon bucket isn't going to cut it if you're planning on making more than 2 gallons of RO water. I use a 55 gallon plastic drum to collect the waste water, which I use around the house & in the garden in the summer.
Mine is plumbed into the cold water line that feeds my washing machine in the basement. I did the plumbing myself. Added a t-fitting, quarter turn shut off valve and slip on JG type adapters to get the size down to the 1/4 inch tubing that the RODI unit uses.
The white drum laying on its side in this photo is what I use to collect waste water.
Here's a link to Buckeye Hydro showing the many adapters available to plumb into a feed line for RODI system. Their FAQ page is a good place fomoinfo about what's required to properly run a system.
http://www.buckeyehydro.com/feedwater-fittings/