When I began playing it, I had a lot of trouble remembering riffs, tuning the guitar, and doing all of those other things, but over time it became much easier and easier to do. I remember struggling to learn the main riff of Smoke On The Water, mainly because I kept hitting the wrong notes.
Let's talk about the differences between the electric and acoustic guitars. The electric guitar requires an amplifier, otherwise the sound of the strings will be very quiet. Electric guitars are generally slimmer and smaller than acoustic ones, but they are heavier due to all of the machinery inside of them. Acoustic guitars are lighter due to their hollow bodies, but they are also bigger.
Electric guitars have a wide variety of effects, but acoustic guitars have a unique sound, not to mention that you can just carry them everywhere as they are lighter and do not require to be connected to amplifiers. About the effects: there are some amplifiers and even guitars that have built-in effects, but generally, you will end up using pedals. Those pedals have a wide variety of effects, such as distortion, delay, tremolo and much, much more. I have a distortion pedal, specifically the Boss Turbo Distortion DS-2.