The heavy equipment needs continue with the next step, which is joining the individual pieces called for in the design through heavy-duty welding, utilizing electric arcs. A watertight craft able to withstand the pressures of deep-sea dives is of course essential to your happiness in your new sub, so make sure those welds are complete. Once the craft is built, you will need some fissionable material -- enriched uranium is most typically used -- to power the vessel (and, if you're anything like Captain Nemo, the giant pipe organ you've constructed within it). Contacting friendly government such as Cuba, China, or possibly North Korea would be a good place to start, though you will need to be careful with whom you speak to so that word doesn't get out (otherwise everyone will be wanting their own nuclear sub!). Iran and other more combatant nations can be approached with greater security. If negotiations with these entities fail, digging for your own uranium is always a possibility, though wearing a radiation suit is advised. Repeatedly microwaving large amounts of lead on high for hours at a time could also potentially create enough fuel, but this method is unproven.

At this point, you've probably realized that the months you've spent constructing your own nuclear submarine have largely been a waste of time. Unless you have an extensive background in engineering and construction,...

Don't let frustration take over, though -- there is another way. You'll need to start by generating large amounts of capital. Robbing several large Swiss banks ought to do the trick -- cash only; jewelry and other valuable are too easily traced. You can also try selling plans for obtaining a nuclear submarine, though the time commitment needed here is greater. After gathering the necessary funds -- you'll know when you have enough -- you'll need to get in touch with the current military leaders of a former Soviet satellite country. Once in negotiations, don't give them all of the power -- remember, they need the money to fund their dictatorial regimes just like you need a nuclear submarine to travel to Tasmania in style.
All that time and energy certainly paid off, which you know now that you're enjoying your new nuclear submarine. You'll be able to travel the seven seas with great efficiency and comfort, and you can even generate some extra cash by selling your story to Tom Clancy for his next novel.