Thanks for some great ideas, posters. I contacted the sibling with the Mexico vacation this morning and suggested helping out by hiring someone to do some of the dirty work, and helping to pay for a storage facility, and he enthusiastically agreed. Sometimes, when you're overwhelmed with the grief and other emotions involved in a stressful and sad situation, you don't see the obvious solutions. So, thank you!
To the posters who have gotten a bit nasty, and called me a martyr and other choice names --- what's the point of that?

I didn't decide on the February work time. Sibling #1 did that. The house needs to be listed asap. Sibling #1 realizes that many of us are teachers and/or have that week off anyway, so the decision was made. I don't understand why people need to start calling names and making accusations. I guess you are just sad, lonely people who like to tell everyone what's wrong with them.
I truly appreciate the ones who gave constructive advice. It will help a lot during this difficult time.
Also --- to those who keep telling me how many days it should/shouldn't take to do this job..............again, not helpful. You really have no idea how long it should take to do this job, and neither do we!!! Not only are we going through Mom's things, but getting the house ready to sell: ripping up carpet, painting, cleaning, etc. But again, thanks for NOT HELPING with your comments. Good grief.