Hi, looking for some guidance please.
We're first time buyers and have been looking at houses for over a month. We've finally seen a place we like that ticks nearly all the boxes. It's in a popular area where houses seem to go very soon. It's on for 200,000. We think this price is in line with what we have seen for this area. It also doesn't need any work doing to it. In my haste I made an offer after viewing the house for 192,000. After reading up online I'm worried I've gone in too high. 
Is there anyway to go from here? Should I contact the estate agent myself on Monday or have I already shown myself as desperate? Even if the house is right for us u don't want to overpay either... I've read people saying to offer 10% less than the asking price?
How to negotiate now please?
TIA