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Look for previous posts for an Olfa knife.
You scribe along a straight edge and then can bend sheet back and forth till it separates along scribe line.
Clean up edge with files, sand paper etc and you are done.
Works very good in many applications.
A super tool and not expensive.
I agree with Jerold, the Olfa is the way to go. It does a beautiful job. It is a high quality scribing knife designed for cutting tile. Here is a link to a discussion on using the Olfa --- http://www.ch601.org/tools/olfa.htm
Not all tin snips (hand shears) are created equal (some are better quality than others). Also it helps to not make such large cutting motions; take small bites and keep the shearing action in closer to the pivot of the shear. Distortion seems to more pronounced out near the tips (points) of the hand shear. Also it is best to first cut about 1/4” outside of the desired cut and then go back and trim the remainder off.
There is nothing like having a foot shear, though.
The Olfa P-800 is commonly used to cut aluminum sheet.
Use a straight edge.
Score Score Score Score ...
Bend at score mark.
I couldn't find a specific video showing it. Although I know I've seen one. However, here's a link to a guy talking about the concept that might help if you've never seen someone do it. Although, the Olfa P-800 knife works great and I would see little if any need for improvement for a hobby/project build type environment.
No ripples with this method. Easy edge clean up. Best method IMHO for a home type shop. Maybe one downside is that this doesn't work unless the sheet is well back (i.e. on table, etc.).
Also, while aviation snips and similar do tend to leave ripples, with a little practice these can be minimized or effectively eliminated. Angling the cutting edge helps. Doing a rough pass and leaving a 1/8" or so will help build up confidence/techniques. I always leave a 1/16" to 1/32" edge to file away if I have to use aviation snips. I've also found planing tools like the Surform to be work really well. Although a bit tricky on 0.016 if you're not careful.
Pneumatic "air nibbler"... Best.....Tool.......EVER!!!!
Buy the videos from www.homebuildhelp.com. "Metalworking 101" and "Scratch building basics for metal aircraft" will be the answer to most if not all of your questions.