Did this and survived just over two weeks ago.
Prepped everything in advance, party bags in a crate with pre cut cake, then had same cake for blowing candles out, all games and party entertainment in another box ready, then a crate with decorations, tape, string, scissors etc.
The bouncy castle guy did his thing, really fast only took 5 mins to blow up a huge castle with slide.
Only had 30 mins either side to get everything up and down, lone parent so just me and son setting up. Hats off he helped a lot, having jobs made him feel important.
The biggest take homes where -
It takes a lot longer to set up tables and chairs than you think, ours were in a storage cupboard which felt miles away from the main hall. The hardest part was juggling heavy fire doors rather than trying to carry.
Jugs only had two (always replenished) but felt like i was constantly watching to refill
(Some) other parents are hell..... one family of 6 turned up 45 mins early, they were waiting outside and complained the room wasn't opened, sat around, and asked where they could get a coffee. Single woman frantically heaving furniture around with no offer of help, so directed them to a coffee shop (which they didn't go to)
Pulled the bouncy castle down for food and games, one Dad flicked the switch to put it back up so his son could go on it, another parent complained that her child didn't understand why the castle had come down so she was leaving due to a meltdown.
Sweeping the floors and packing the car up is hard when people won't leave and mill around chatting.
Carrying the gifts to the car took longer than expected, thw sheer quantity was unreal and my child was very lucky and fortunate, but naively i expected small ish gifts, but the gifts were huge!
BUT, you can do it! The sense of relief and pride left me on a high, i was very anxious before especially being a lone parent who is an introvert! I really had to psyche myself up to even book it, but didn't want my child to miss out due to my poor life choices. So go for it, have fun and try to enjoy it :).