I saw a quote from Jim Wendler recently that basically said - "Find a way."
I've been coaching lifters remotely for about 6 years now, and clients fall into two buckets.
Bucket one:
I couldn't use that machine because someone was on it so I skipped it.
I couldn't bench because my elbows hurt.
I didn't have time to fit my last two movements in.
The SSB was being used so I didn't know what to do.
I didn't get enough sleep last night.
Bucket two:
I tried benching but my elbows were still sore today so I switched to some dumbbell bench and was able to get it done.
Someone was using the SSB so I hopped in with them. They were using chains so I dropped some bar weight and was able to get it done.
I was late getting to the gym so I had to go back in the morning to finish my assistance work. I was able to get it done.
Notice a difference?
Find a way. Just get something done. Besides maxing out or just doing something totally off base, there isn't a whole lot you can do in a single training session that can't be adjusted for. But when you just skip things, or throw your hands up and say "I can't" or "I couldn't" then I have a hard time feeling sorry for your lack of progress.