Yes… you have many avenues to research on how to locate a short in any circuit. Like i mentioned prior…you will need at the very least a DVM…these are inexpensive tools that can do a wide array of functions if you know how to use it correctly. The instruction manual that comes with it will be very informative to you.
The Power Probe I mentioned is another very useful item as @tcmichnorth surely knows…they are sometimes invaluable.
Anyhow…look on the internet on how to locate shorts in circuits…there will be plenty of information out there for you to read through I am certain of this. Also look at how your fuse panel divides your lighting system… If you notice that each corner is isolated by fuses…this is a good thing. Each mfg goes about circuit protection in a different manner…some divide it front to rear…others divide it into 4 corners… the more divisions the better in your instance.
If you have it divided into 4 corners…simply pull one fuse at a time and repeat whatever action you performed that would blow a fuse. Do NOT install any fuse that is rated higher than what was there prior… If it has a 10 amp fuse…replace it with another 10 amp fuse…do not install anything stronger…weaker is ok… but def not stronger.
If you pull say the front left quadrant and do your test and the fuse does NOT blow… you now know the fault is in the front left quadrant somewhere… So this isolates and concentrates where you need to look and what you need to repair. Savvy?
Let us know how you make out.