Call of Duty: Modern Warfare 2 (2009)

'Just like old times'
So from where you get dropped off, just follow the mission along take out the first guards and the dog and then when you grapple down in to the cave areas be ready for a crazy fight, it is all easy until you get past the stairs part, captain price goes to the barrels but I backtracked and went back and down the cave to the left which gave me great cover and allowed me to just pop up and shoot, i also recommend having a riot shield for this as it is good to have protection, don't rush forward and take them one at a time, if you take damage quickly go prone and get out of the way, it took me about 40 minutes roughly, when you come out of the cage after the explosion and the enemie heli drops of loads of men, just really take your time here and use the jeep cover as much as you can, this was a really tough section for me..

When the men with the riot shields come down take it slow and grenade behind them...the last part where you need to break the door open just be so careful not to hit the explosives! and then you are free to the next part

Endgame
Make sure you fire your gun at all times and just dodge everything, I died several times trying to get to the thin cave, and when you get to the open river just shift right and left at all time so nothing gets you, it's all a bit of trial and error so it may take a few tries, and then at the end of the boat driving you fall of the edge, then the rest is plain sailing, just follow shephard.

COD MW2 TOP TIPS FOR VETERAN:
1. Always use a pop up and quickly pop down method in shooting enemies this works best.
2. If you are hit then go prone and wait for the 'jelly' to come off of your screen
3. this game is alot easier for veteran, mainly because the enemies don't infinately respawn, and the checkpoints are also rather kind to you (except on the mission 'takedown' where things get tricky)
4. don't rush it! take your time, you will end up spending more time redoing it if you rush.
5. Let your allies clear some of the enemies while you hide.
6. always throw back grenades(they have a long clock so throw them back)
7. use smoke grenades and flash bangs they work very well especially in the caves when there are just loads of enemies.

I hope this helped, I may update if I remember any more stuff about the missions, but this should be a good enough guide to get you through, the order may be a bit confusing. :)