I got started as a LL in seattle, and still have one property - a triplex - there. When I got started (2006) seattle only had just cause on top of state LL/T laws, and one of the just causes was 'term lease expired'. Times have changed.
My advice to somebody looking to start out in seattle now (and who already owns a property there, so "look elsewhere" isn't a simple option:
1) As previously suggested, join RHA. Take advantage of their new landlord and fair housing classes.
2) read entirety of Seattle and WA's LL/T ordinances. Especially understand implications of things like roommate ordinance, first in time and fair chance, deposit installment payments, annual eviction moratoria,
3) Have the financial reserves available to withstand two years of nonpayment, on top of costs of eviction proceedings and supporting a deadbeat tenant.
4) seriously consider PM from day 1. True, its a 10% cost off the top if you have only 1 or 2 units, and I didn't hire PM for my first 10 years or so, and I learned a heck of a lot by managing things myself about me, other people, and the business. But its a different world than it was then.
5) changes in LL/T rules have made term leases in seattle almost pointless. It used to be this was the easiest method of having an out to get rid of bad tenants by nonrenewing, but this is NOT AN OPTION in seattle anymore. (It still is statewide under narrow circumstances) My philosopy which has served fairly well is never get in the way of an unhappy tenant who wants to move out. In fact I often incentivize tenants who are acting out to move; for example like offering to waive cleaning costs as long as they empty the unit, and not penalizing them for lease break.
6) Screen, Screen, Screen. Charge the highest rents you can to also prefilter out the weakest applicants. Don't try to do someone a favor. You will hear sob stories if you are meeting applicants yourself. Don't fall for them. Don't fall for the I-have-X-months-cash-I-need-to-move-in-today routine. You'll never see any more rent after that. They have that much because they weren't paying the last landlord and are getting evicted probably. All this screening, calling employers and prior LL's and verifying they are legitimate can be tough especially someone (like myself) who has nice-guy syndrome but it is critical to protecting yourself.
Finally, I'll paraprhase what was said above - One bad tenant is as much work as 20 good ones. You don't want that bad tenant especially just starting out. There ARE 'professional tenants' out there who seek out new and inexperienced landlords hoping to take advantage of you. So do everything you can to avoid them. Its a fairly low risk, but when it does happen is when you see these disputes in the news. It is getting more common however I think though I won't dive into the editorial as to why.