Tried cutting my own hair after a hair transplant (first time)

I got a hair transplant back in August so I don’t need to line up my frontal hairline and I just tried a taper fade. I’m scared to line up the back because I don’t have the best hand eye coordination. I did much worse on my left side cus I’m right handed and it’s really uneven now. Any advice? I have a big forehead so I want to only do low taper fades