Failure most Feline

Today I feel like a complete failure as a cat owner.

When I brought my cats home from the shelter, I knew that they were going to take some time getting used to me. It took Legend a few days to stop hiding and actually come to me; and it took a couple of weeks for her to feel comfortable coming to me for affection. Labyrinth took a week or maybe two to stop hiding and she still doesn't like it when I approach her... unless she's lying on her favourite chair (in which case she'll let me pet her) or unless I'm lying on my bed (in which case she'll cuddle up with me and let me pet her). I've been working for months to help her build up a tolerance to me; but she never really got past the point of running away from me when I approached her.

So today I was going to take them both to the vet, just to get them checked on. I knew this was going to be hard. I had no idea that it was going to be impossible. Labyrinth wouldn't let me get near her and hissed at me any time I came close enough to grab at her. She got really stressed out and hid and after a little while I realised that the trip just wasn't happening today. Now she's hiding in my room and sulking. She's glaring at me any time she sees me and refuses to be in the same room. I feel like I ruined everything that I was building with her.

I've had these cats for a few months now. And I still can't get them both to trust me. I'm clearly doing something wrong and I don't know what. Watching her skulk around like I'm going to bite is really doing a number on me.

But I do need to be able to approach her. She's going to need to go to the vet soon. She's going to need to stay at another house while I'm away from home. :-/ I don't know what to do.