I only play a bit of micro-stakes and Titan Poker gave me an invite to freeroll Satellite to their 250k guaranteed, I managed to win it so I have a ticket to a $200+15 tournament which is way out of my league 
Do any of the guys who play these kind of MTT's a lot have any hints what kind of mistakes they see a lot from people in my situation or what is the best way for me to play, its 10k starting stack so super deep which I havnt experience of either 
Cheers,
I'm not going to give specific advice because I am hardly an expert in MTTs. I have been in your position, having played in a couple of such higher stakes events. What I would say is that I was surprised how many weak players there were. Less good players still get in those events - probably via satellites, or because they are rich. I wouldn't allow yourself to be overly intimidated.
The best players are going to be better than the best players at lower stakes, but there are still going to be fish.
Play your most conservative game, and don't be scared nobody knows your play but you(until you start showing hands) so don't feel over intimidated, you have a great chance to make some change so just play tight and make it your goal to make it ITM, once that happens its a good profit so you can take more chances and try to make that final table
Good Luck 
I still have one token left for that tourney so I am going to try it again soon hopefully I can make it
I think the blinds are even 20 min, with a 10k stack you have TONS of play so don't feel pressured like a regular tourney
I think going allin every hand should be standart in these tournaments. And if you happen to bink it, put it all on red.
