Normally you would not get a case dismissed prior to pretrial unless there is a really obvious problem for the prosecution. It is good that you have a squeaky clean record. Things may not be as bad as you think. I would have to know all the facts of the case to really assess what the likely outcome would be. This kind of charge may be hard to prove especially given that it is charged as "attempt." You need a attorney who is a great trial lawyer...it is that kind of case. If you need to go to trial you need experience on your side.
You need to discuss all your legal options with a good criminal attorney licensed in Washington in person as the charge is very serious and will have a lifetime effect on your life.
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If you have the means to hire an attorney than do it. If you don't then you must deal with the attorney that has been appointed to you. If your schedules are not meshing then talk to the supervisor, assigner of cases etc. and see if there is a different attorney that can be appointed to satisfy your time table. You may just have to be patient and deal with the attorney appointed. These are your options. Don't talk about your case on the internet and don't give details here!! Good Luck