The LectraSan is very easy to install. It is roughly the size of a group 29
battery and can be connected to either an above-the-waterline or below-the-waterline
thru hull for discharge. As long as the two toilets are within six feet of the LectraSan unit, one unit will easily serve two heads. I've seen installations further than 6 feet apart; it just depends on the
pump. The LectraSan does not have a
pump itself; it is simply a macerator and treatment device. Make sure your pump can pump the waste through it and out of the
thru hull.
Just remember, you will not be able to use the LectraSan unit in fresh
water, unless you have an external supply of
salt water. Some
parts of
Puget Sound also have low salinity levels in the ocean; and people with Lectra San units have been unable to successfully treat waste. I would recommend PuraSan over LectraSan, as it uses chlorine tablets to treat the waste instead of
electrolysis.
As far as you abilities are concerned, someone with a 6.5/10 knowledge base should have very few concerns about
installation. The process is straightforward; and the
plumbing is going to be the most difficult part if your space is limited.
Best of luck! Hope this helps.