Well, keep at it. Learning to use photo editing software can appear daunting at first, and progress may be uneven, and then BOOM! Suddently you understand things like the curves tool, levels, and how to 'tweak' an image file so that it looks reallyt nice. I would say that if there is one,single tool that can help one edit faster, it is the curves tool. Very powerful, and so,so fast; a simple multi-point curves adjustment can be done in 20 seconds or so, and can take an average camera-set exposure and make it so much more appealing. The other tool with tremendous power is the cropping tool!
One thing about fireworks: MANY times, they tend to be greatly over-exposed by the camera's metering modes when shot in timed automatic metering modes. And also, many times well-seasoned shooters tend to over-expose fireworks by using too high of an ISO value, or too wide of a lens aperture. ALso, the closer you are, the brighter the fireworks are (inverse square law makes fireworks light dimmer at longer range, just as it does with studio lighting!).
For fireworks shot from a tripod in Manual exposure mode, one wants to use an ISO of around 100, and a lens opening of f/9,f/10, or f/11 for "most" commercial fireworks shows that are shot from 100 meters to 400 meters distance. The fireworks are themselves, the exposure, the subject, the flash-pop! The shutter speed is Bulb mode, or a slow speed, like say 10 seconds to 25 seconds....a black card may easily be held in front of the locked-open lens, and used as a "shutter" of sorts, but the issue is that the ISO value, and the lens opening size, are what determines the exposure of the bursts...and again, many people tend to over-expose with too high an ISO setting and/or too wide a lens opening, and this causes the bursts centers to be blown-out in color and pallid, instead of having rich color.
Remember a spare battery for fireworks shows. TURN OFF long exposure noise reduction too, before the show, in daylight! it will cause the camera to be inoperative while it does the L-E NR after each long exposure!