Tree Trimming

Tree Trimming

I was wondering if anyone knows of an online resource for tree trimming that is actually reputable. I'm wary of a google search because you just never know the people's reputations. Specifically I am in zone 8 with two Arizona Ash trees in the front yard. The branches tend to bend easily and sag, making an unattractive border to the tree. I'm looking for advice on how to trim it myself. I have a small tree-trimmer available to me. thanks in advance for your help!
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what are these bugs?!

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my soon to be apartment!

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Herb questions (and photos)

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Chinese Water Chestnuts.

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Thunder Bay Horticultural Society Annual Flower, Fruit and Vegetable Show

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Future Domestic