Staking question, how much to sell?

[JohnSmith]

I am going to play the APPT in macau and this will be my first live tournament. My bankroll is around 20k. All up the event is going to cost me $2500 (entry fee) + $1400 (plane ticket) + $600 (hotel) + $300 (general expense such as food) = $4800

Tournament background:

1st small 6 max tourney
2nd small 6 max tourney
FT in sunday mill warm up
top 18 in sunday mill main event
and a few other cashes here and there

Question: How much of the $2500 buyin should I sell off? 20%? 30%? Im very new to staking, any help is appreciated.

Thanks...

[Xaston]