this is a good read hope it guides you a little...
http://www.filipinawives.com/soannulment.htm
Yes some lawyers do a NON APPEARANCE procedure but i will recommend that the Petitioner attends the pre-trials and some court hearings so she knows where her monies really going and that is really being done appropriately.
300,000 and more is quite a big amount for annulment ..when i left the philippines (may 2010)the current on going pay with the solicitors is only up to 200,000..most lawyers charge the same or nearly the same amount they usually give a quotation to clients have an agreement sign both parties (the client and the lawyer )before they start the case ...lawyers cannot guarantee a quick result but u need to hound 'em all the time to remind them that u are paying them and so they need to do their job.
Alou needs to prove SOLE RESPONSIBILITY for her children means that the ex has nothing to do with the decisions,schooling,shelter,etc of the children
Getting an annulment can be a gamble...so u just have to make sure the odds are stacked in your favor
Goodluck!!