New Retiree Looking for Doc Review Work

I'm an attorney in the federal government who is retiring at the end of the month. While in private practice 20 years ago I did some electronic document review, but I have no recent experience with it. From what I can tell from descriptions online, it doesn't seem to have changed much. That said, I can't remember which system my firm used to do the document review and would be uncomfortable representing myself as "proficient" on whatever systems are commonly used today. I would definitely need a little instruction to get up and running again. My resume is pretty strong, so maybe that would compensate for my lack of recent doc review experience?

I have a pension and am only looking to work for a few months out of the year to supplement my income. Is it possible to work for say 3 or 4 months? If so, would those months be consecutive, or is the work sporadic? I don't mind working for a month or two straight or working a few days a week every week. I just don't want to be on the hook for more than 4 months because I have other things I want to do in retirement.

Also, is there a going rate for this type of work? And, would I be a W-2 employee with taxes taken out, etc.? I don't need benefits, but it would be nice if I didn't have to worry about quarterly tax payments to the IRS.

Any advice/suggestions would be much appreciated! Thanks in advance.