easy ? Sure.
First off remove the old head unit, you'll probably need the keys that go in the holes for ford/chevy etc.
Here's a recount of a stereo install:
remove stock radio , purchase removal tool.
purchase wiring harness and plastic kit to hold new stereo ($20)
plug in old wiring harness to radio.
turn on - test. no sound.
Realize there is factory amplifier in car (!!)
remove amplifiers, cut up wiring harness to work correctly.
put back together.
turn on, works.
!!
drive around with loud volume.
(next day)
realize all speakers are blown because factory speakers are like 10-20WATT max.
Go buy some pioneer 6x9s for back, 5 1/4"s for front. ($200 for good quality pioneers).
plug in.
realize the head unit above has not enough clean power (only about 25 watts rms clean).
Remove head unit.
rewire RCA jacks to back of car.
wire 12V and ground to back of car.
($25 in good wire plus fuse block)
Install amp. ($175 50x4 JBL clean).
Install noise filter (noisy car) $20.
Put it all back together.
sounds great.
Now to subwoofer.
Advice: Take this to a professional audio installer, pay them between $25 to $50 to install the head unit. EXPECT your stock speakers to die very soon, so while your at the stereo shop, have them put in some new speakers all around. Keep in mind, Good speakers are about $100 a pair for 6x9 size, or $$ more $$, about $70 for round 5.25".
Good speakers are: Pioneer, sony,fosgate,jbl, infinity NOT FLEAMARKET stuff.
You need to get speakers rated for the RMS clean power output of the head unit, in the case of AIWA, its not very much power about 25 RMS (it distorts above this).
Aiwa is generally on the bottom of the food chain, ie JVC PANASONIC ROCKWOOD ECLIPSE. Very low end stuff, expect it to last maybe a year, expect it to sound inferior.
just an fyi.
Yes its a neato idea. One cd-rw can have all your songs on it, and you can erase and re-write it when you get new stuff. saves about 10 cents a week for me considering todays prices on blank cd-r's.