What do you want the lights to bring to the table? Seems to me that most people are looking for either:
1. Increased day-time conspicuity (dunno if that's a real word) to traffic
B. Throwing light down-range for night-time riding
If your main goal is #1 above, a lot of folks add lights to the forks, mounted on the brake caliper bolts. There are many lights out there - MotoLights, Clearwater, cheap-o Ebay specials...
If your main goal is #B above, a lot of folks add lights using brackets under the mirrors. Garauld used to make brackets, but I think he's outta the bracket game nowadays. Wynpro (AKA Dave, AKA 08FJR4ME) makes some really good brackets.
If your budget allows it, Clearwaters are very popular.
I'll tell you my aux light progression:
I tend to avoid riding at night, so my main reason for adding aux lights was for #1 above.
I started with a set of Hella FF50s mounted on Garauld's brackets. I added a marine-grade, waterproof switch from West Marine. I don't know squat aboot wiring stuff, so I put out an SOS on this forum. Richard (AKA Fairlaner) sent me his phone number and we spent a half-hour on the phone. He walked me through how to wire 'em and they worked!
I had the FF50's for a long time. Owning the far superior GenI, however, I need to actively manage my watts, and the FF50's have a bit of an electrical draw.
As LED technology has progressed, I kept an eye on LED alternatives. I woulda gone the Clearwater route, but that's bit outta my price range for a set of lights.
I wound up with a pair of LED's made by Rigid Industries.
With yamafitter's help, we swapped out the FF50s for the Rigid lights at Tech Day a few years ago.
On the ride home from Tech Day, it became apparent to me that the Rigid lights are heavier than the FF50s. They vibrated a LOT on Garauld's brackets.
I got a hold of Dave and he whipped up a pair of his brackets for me.
And that's what I have as of now. I would like to add a pulse-width-modulator (AKA a dimmer for LEDs), but according to Rigid, the lights I have a not dimmable. I dunno. I've got a PWM laying around but haven't bothered to mess with it.
So, for your requirements:
1. No cut / splice / etc. Power for mine comes straight from the battery. I have a relay added so that the power doesn't go through the switch. Rain has killed two relays over the last 9-ish years. Depending on your amp draw, you'll prolly want to either power them directly from the battery or, maybe, from a FuzeBlock.
B. What to mount 'em on. Like I said, I've used Garauld's brackets which were fine for the FF50s and now have Wynpros for the heavier LEDs.
iii. How to control them. If the lights come in a kit, there's usually some kind of switch included. Assuming you go with an LED solution, you're prolly gonna want a dimmer / PWM. Other folks have experience with PWMs, so I'll defer to them to speak up. I mounted my switch on the same panel where the emergency flasher switch is located. It's an outta-the-way spot, but in retrospect, I would prefer something up on the left handlebar.
One final note: the Rigid LEDs throw out ~ twice the lumens for half the watts of the FF50s.
Here are a few pitchers:
Rigid LED light mounted on Garauld's bracket.
Back view.
Wynpro bracket on the left, Garauld bracket on the right.
Back view of the Rigid light on the Waynpro bracket.
Front view.
What it looks like with the amber lens covers on.