I work full time, shift work, 7 day roster, and have 3 eBay accounts which I have no problems keeping up with (unless sales go through the roof, then I can get a bit snowed under. I also don't have a store, so am not trying to keep up with thousands of listings). When I get new stock in, as I'm unpacking each item I measure it, weigh it, label it and photograph it, then leave feedback for it. Once I'm finished doing that I'll edit the photos. That generally consists of cropping to make the photo square, making white backgrounds white and black backgrounds black. Sometimes I need to adjust the colour a bit, but usually it's just the backgrounds.
When the time comes to list, I use the sell similar option. That way all the basics are there and I just have to alter titles, photos and descriptions. Photos can sometimes be slow uploading, so the first thing I do is delete the photos that are present and upload the new photos. While they are uploading, I alter the title and description for the new item. Generally by the time the photos are loaded, I'm done with the adjusting. As all the basics, like the boring bits, postage, duration, all that stuff are already in, a listing takes me as long as it takes to upload the photos.
I haven't looked at your listings, but as an example for a listing you could have:
Title: Sportsgirl Size 12 preloved black evening dress gown (use up all characters if you can using as many keywords as you can).
<description of item you're selling> e.g Beautiful preloved evening dress with pencil pleat skirt, shoe string straps and lacy bodice (I don't sell clothes so just making stuff up). There is a thread pulled in the hem and a small scratch on the zip on the back. There is also 1 thread in the lace that is broken but it doesn't affect the look of the dress at all.
Then you could have:
Colour - black
Brand - Sportsgirl
Size - 12
Measurements (laying flat) Xcm across the bust, Ycm across the waist, Zcm across the hips, Acm from neckline to hem.
Faults - pulled thread in hem, scratch on zip, 1 broken thread in the lace.
Then you could go into the boring stuff, like your terms and conditions.
Add your postage details, payment details, duration and submit the listing.
Then to list a new item, use the sell similar option. Then your basic template is there and you only need to change the key things to suit the new item. After you've got quite a few things listed, if you've already got a black dress listed and you want to list another, use the sell similar on that listing as there are less things you need to change, like you would if you used sell similar on a pink t-shirt.
Working shift work, I often get home at 3, 4, 5am and can't go straight to bed. I'll do a few listings then and schedule them to start at a more appropriate time (I run auctions so like to have them end in the evening rather than 3am, but if you're doing all BIN's, it wouldn't be an issue sending them live at 3am). I'll also edit a few photos that may not have been done previously.
There are quite a few clothing sellers on this forum, but I'd strongly suggest having a look at Cats listings. She is very successful at selling clothes and has been doing it for quite awhile. I am not suggesting to copy her listings, please, don't do that, but you should be able to get some ideas on what you need in a listing to successfully sell clothes, especially as it's a saturated category on eBay. You want your listings to stand out. Hers stand out and her buyers are happy, as is evident by her good feedback. Plus she sells a fair bit so is clearly doing something right.
Once you get into a bit of a routine with listings, it's not really that hard to handle a few accounts and have a full time other job. If you find you are struggling and do need help, why not offer a job to a teenage computer nerd, who cost less to pay and would be grateful for a few tax free dollars (shhhh, I didn't say that!)? They seem to like graphic design and all that kind of stuff, so they could show off their artistic flare on your eBay and really help your listings to stand out. Plus a teenager is less likely to try and go into competition with you, as someone like a stay at home mum might.
