Replace tranny dipstick tube

What is your question?

I need to know how to replace the dipstick tube on my 07 Denali xl 1500 it's been lose and it wiggles around and has for a couple months and winter is coming I don't want all that stuff in my tranny . Is it hard to do? I don't have a hoist but I have it about 3 ' in the air on jack stands Doni come in from the top and work it around or try from underneath and weaving it through?