This being my first season in the business I have lots of questions, but today the big one is how to bid installation of weed barrier in an existing bed. The yard in question has been neglected, no fresh mulch for years, never a weed barrier. Lots of low shrubs in the beds. The mulch bid is no problem, and I know my cost per square foot of weed barrier. What I'm not sure about is how to estimate the time required to install the barrier. The other option I thought of is just skipping the barrier and treating the mulch with Preen or something similar. This would be cheaper for the homeowner (though requiring regular treatment), and a lot less messy for me. Thoughts?