You don’t say what kind of trees you have. There are different considerations for each: Ash, Elm, Oak etc. 

if you choose to find a tree care professional be sure to ask questions up front to feel confidant in their expertise. 

You may want to call the city of Sherwood to see if they have a city forester willing to come out to look at them. If it is Dutch Elm disease, Emerald Ash Borer or Oak wilt, they may have requirements for you to respond to the issues. 

If yo feel they are unsafe you want to act now to avert any damage to property or persons. 

https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional