There is no reason not to have a realtor helping you find a house. I would recommend finding the largest realty office in the area you are interested and let them know what you are looking for. Sometimes they’ll have a listing come in and will let you know about it before it is officially listed. But remember, as was stated before, THEY REPRESENT THE SELLERS AND NOT YOU.
Realtor.com should become your friend. I also don’t think you should shy away from a home being sold by owner, but be sure you know the value of the home. You should be able to find other recent house sales in the area to make the determination. Check with the county for the record of home sales. In my area, those are actually available through the web. Zillow.com might be of some help, but from what I’ve seen they aren’t all that accurate.
If it were me, I’d save up until I had the 20% down. As others have said, PMI really gets you nothing but $100/month expense. I’ve heard of other people that did as you suggested and had a second loan to get their mortgage/value ratio below 80%.
Closing costs can be anywhere from 1% to 5% of the loan. However, by far your biggest expense is going to be the interest you pay on the loan. Shop around for a low interest rate.
You’ll have to check with your county for your tax rates, but those are again all public record. Principal and interest would be about $875/month on a $150,000 loan. Insurance is again going to be highly variable but check with an agent to get a ballpark figure.
You also need to consider other costs you might not have now: garbage, water, sewer, cable, etc. And don’t forget to set aside at least $100/month for maintenance. Also consider the age of the roof and furnace. Those can be huge expenses and if they are going to need to be replaced sooner than later you may want to set aside more.
The good news is that for the first several years pretty much your entire payment is deductible. In essence, Uncle Sam will be paying for 1/4 of your house payment.
Don’t forget you may need to make some purchases for your new house:
Yard equipment (lawn mower, hoses, etc.)
Appliances (washer/dryer)
Tools (ladder)
I would not buy a house that needs more than 3 or 4 “fixer upper” type things. You’ll likely never get to them.
For our house, we offered up a bounty to friends/acquaintances to find us a house. It worked. We found a house that a friend of a friend was planning to sell and hadn’t hit the market yet. They had been planning on using a realtor, so we split the realtor fee (6%). Saved us both thousands of dollars.
Other advice that has already been said but bears repeating:
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Find your own attorney to review the sales agreement. It will cost you $100 to $200, but it will be money well spent. Be sure you have a clause that says any problems need to be fixed to your satisfaction.
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Get the home inspected by a reputable home inspector.
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Real estate agents are not on your side. They want the sale and represent the seller, not you.