Central locking (keyless) is fairly sims to install as its stand-alone with a bunch of servos to make doors open & close.
Alarm can be a little more trouble as it will hook into the ignition, lights etc and has switches that activate on bonnet, boot etc. depending on which ones you go for.
If you can use a multimeter, test light, read a basic wiring diagram & find wires in a loom you shouldn't have too many dramas.
Start on a Saturday morning & you should be done by mid arvo.
Take ya time, measure twice & solder ya joins.
There are several brands & range from $50 upward.
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