*THERE WILL BE SPOILERS FURTHER DOWN*The main purpose for me posting this solution, besides the fact there`s none else up yet is so you know in all honesty Battlefield's games Hard difficulty aren't really that bad. At least compared to the hair pulling, sometimes rage inducing portions of other FPS games on Veteran. If you've ever completed a previous Battlefield or Medal of Honour on Hard give this a go right off the bat to save yourself an additional play through. If you've completed any COD on Hardcore or higher you should be fine as well.
Not to say there won't be difficult portions of this title, there will be, but none that are impossible. I`ve never come close to running out of ammo, the game always give you the correct weapon types for the situations ahead and you should never be confused which way to go next. Just take your time,
use cover and wait for your squad to take point unless you're the point man. The AI is pretty good in this game and although they won't do all the killing,
what would the fun in that be really?, they do a good job of eliminating a good deal of threat.
The couple difficult sections I can remember I had to retry a few times
* SPOILERS SPOILERS * are:
On
Comrades preceding the nuke detonation in Paris, coming out of the bank leading up to the
I was trying to go for the

The The Professional achievement in Battlefield 3 worth 61 pointsComplete the street chase in Comrades in under 2 minutes 30 seconds without dying at the same time while playing this on Hard...not a good idea. You need to grab cover, engage those in your way and only move up when the other two guys do or you`re pretty much dead after you run onto the street from the bank.
On
Thunder Run, immediately preceding

The Scrap Metal achievement in Battlefield 3 worth 38 pointsDestroy 6 enemy tanks before reaching the fort in Thunder RunThese enemy tanks will light you up if you don't dispatch of them quickly. Make no mistake, keep on the move and don't be a standing target or the mission failed screen is sure to appear shortly.
On
Night Shift immediately after obtaining
I stayed crouched behind the first coupe on the road to your right, engaged the enemies as they came in ahead of me and every few moments I checked around the back side of the car because two or three enemies come from there and try to blow up your cover.
You may become pinched at other parts in the game, but if you do the three things I`ve mentioned; take your time, use cover, and let your squad take point and do some killing it becomes a lot less challenging. If all else fails, take a break from it. Seriously a fresh set of eyes and reduced stress can make all the difference. I can`t tell you how many times I`ve sat and tried to beat something just to get frustrated, put it aside for a short bit, came back and was able to knock it off on the next shot.
Hope this helped save you an extra play through because even though this was a decent, griping story and a beautiful game, we know the meat and potatoes of a Battlefield title is the multiplayer ;)