Anyone has experience in building a house with plan from website?

[Amy Xu]

I am building a house on the lot. I wanted to use the architect but learned that it costs a lot of money. I'm thinking of building a house with the house plan from website. Did anyone have experience with this? Is there a legit website I can go to to buy a plan? Will this be modified by architect afterwards? Is there any pros/cons you could share? 

Thanks.