Tuning need to be able to determine whether or not it is feasible to tune the piano myself & if so what tools I will need and how to go about doing it.

If you are marginally interested in the process of tuning the piano, and your main motivation is to save the cost of a professional tuning, bite the bullet and engage the services of a qualified tuner. Trying to do it yourself will become overwhelming very quickly. If, however, you are genuinely interested in the skill of tuning, and willing to invest the time and effort to become good at it, then get yourself a star tipped tuning hammer and some mutes (eBay will do) and start to see what you can do to make your piano sound better. Begin by getting the whine out of individual notes by tuning the strings to each other. Search out the "Every which way you can" tuning article by Kent Swafford on your favorite search engine for an introduction to aural tuning. If you're inclined to start out with an electronic tuning aid, check out Tunelab Pro - a free, fully functional demo is available for download to your laptop. Remember, however, that an electronic aid only shows you whether you've hit your target for any given string. Learning how to finess the physical motions of tuning so that the string stays on target for more than a few minutes is another process altogether. If your first couple of forays into trying to tune don't drive you around the bend, then consider finding a qualified piano technician who would be willing to provide lessons for a fee. If your interest holds up, investigate the resources for learning that are available through the Piano Technicians Guild. Their source books and monthly journals are second to none, but unless you are committed enough to the process to become an associate member, the non-member prices for materials are pretty high. "Piano Servicing" by Reblitz is another excellent source of knowledge. It might be in your local library.

Only if you use it, there is only a need to re-tune it if you use it