Lets start from the top, what is the easy way to remove the 'engine cover' clips covering the battery?
Just push down on the clips..... It's real easy. Once you lift the plastic covers, there is one bolt holding the battery down. Just lift the tie down up and pull it out. Unhook terminals and swapped batterys.
I've changed my battery twice so far, and no issues in both times.
You may need a flat piece of metal to remove a couple clips on the lower end of the battery plastic cover whereas the clips on the upper end can be removed by pressing the clip to loosen it and take it out afterwards (if I remember correctly).
What to expect after the battery change?
Well, expect the radio, clock, seat memory settings to have gone briefly. In few minutes everything will go back to where it was before the battery change. Also you'll notice the rpm gauge will act differently for quite a while before it settles down. At least this is what happened with me in both times when I replaced my battery.
Last and most important thing I'd say is pick your battery wisely. Consider DuralLast Gold. Only if I could ship it to Saudi Arabia, I wouldn't be investing $100 and 4 hours of inconvenience every year on a damn inferior battery designed to last one day past the warranty.
Maybe that happens to some cars, just helped a friend change his out a few days ago and only needed to adjust the clock and reset the radio station. Maybe this occurs if the battery is drain or removed for a period of time.
"if u gonna cry what the hell the baby gonna do?"