I have many of the skills mentioned so far here, including a couple years on bench technician repairing dense system pc boards. Might be satisfying to do a less complicated build, that does the sound and LED driving you need:
Try purchase a couple of 'drug store' greeting cards (Happy Birthday, etc.), that has sound / lights & also maybe a moving portion (like a paper 'hand' waving.
Similarly, I've purchased inexpensive toys that have interesting features; A little battery powered 'bird', that chirps and sings, triggered off of a light sensitive part (Cds photo resistor).
With that 'bird', you can experiment with the photo sensor, for perhaps a hand wave in front of your frame....maybe the robot bird sitting on a piece of little tree branch, there in the frame.
And even that frame could be done by converting some (cheap) picture frame, maybe obtained from a 'crafts store'.
Battery operated things like this are fairly safe, for a beginner, and can be modified in experimental ways:
Try, place a small speaker in series with an output originally intended to drive a small d.c. motor. Just for your curiosity, but many times a motor driver circuit has tone sounds and click noises (from circuitry originally for driving motor, or solenoid).
You can also try out an LED in similar (experimental) but also place a resistor, around approx. 200 ohms, that will blink and flutter, according to the toy outputs intended for a motor.
As to safety, those sorts of toys or electronics greeting cards often are seen to run on 3 battery cells...; like 3 AAA batteries, that sort of thing.
I suppose you could label (my own) approach, to involve pre-built stuff, as 'gorrila technician', meaning use of ordinary parts, that had other intended uses.