I like
Armored Core. I've played, well, at least
most of them, if not quite
all of them. Even so, I found some of the missions to be frustratingly difficult. It seems like I needed to get access to upgrade parts faster in some cases and on one mission, in particular, I failed to realize that I need a
specific tool, rather than larger weapons, to finish the mission. At any rate,
For Answer is going to be much easier for a seasoned
Armored Core fan to play than for a new player. While there is probably enough information in the game, the tutorials and the manual to get along, it could be highly frustrating to try to figure out some of the things if you're completely new to the series.
If you're not a "tweaker" - that is, a gamer who likes to fiddle with the minutia of a game, setting up your character or buying new items, swapping out old items and trying out new setups to see what works best - if you're not one of those, you probably should avoid Armored Core: For Answer. For that matter, you probably won't get much out of the entire Armored Core series without at least a little tendency to fiddle and tweak. That's okay. My wife, for example, is an excellent gamer... but she couldn't be bothered to configure an AC. To each their own.
As for tips, I would say spend your credits wisely, and don't accept a low score on a mission; if you think you can do it better, try it again and you could finish with more credits. Once you know what needs to be done in a mission, you can often find a way through using less munitions or getting a better score (and hence, better pay) by concentrating on the best targets or minimizing collateral damage.
Other than that, I can only suggest, "practice, practice, practice." You'll need to give yourself some time with newly added weapons to get a good idea for how best to use them. You can work your way through your missions, and you can always revisit your favorites after they've been completed or play against others online to get more practice in. It's important to "get to know" your AC. You'll see that practice really helps when you return to your missions to continue your progress.