I had a v fast labour last time and had an unplanned homebirth. By the time I realised that I was definitely in labour I couldn't move. The midwives' phone numbers were on my notes in my bedroom a few feet away but I couldn't move to get to them, and my DH was in the garden out of earshot. If I hadn't had my mobile next to me I'd have delivered on my own.
I've had the odd shiver down the spine moment thinking about how things could easily not have gone as well as they did. Don't know if they'll be any use to you but this is what would have worked for me:
keep your mobile with you ALL the time (literally on your person) and have relevant phone numbers stored on it - eg midwife, hospital, DH, local friends. Get as many neighbours' phone numbers as possible. Anyone who can open the door to paramedics and keep your other child/children safe. Keep your phone charged up all the time too.
hide a front door key outside the house - somewhere you can describe easily to a 999 operator. If I'd been on my own there's no way I could have opened the front door.
Get some basic information about delivering a baby! eg don't cut the cord, bum in the air to slow things down etc. Be ready to catch the baby as it comes out.
Get the mobile numbers of your community midwives. Mine was off duty but thankfully answered her phone, contacted her colleague and the two of them were at the house within 5 minutes. The baby arrived 15 minutes later!
If I was planning any more children this is something that would be hanging over me for the whole pregnancy, so I really sympathise with you. I'd learned hypnosis techniques and had my music on and that stopped me from panicing, and made the delivery much easier for me and the midwives. I know that you're asking for practical tips but I strongly recommend the hypnosis for keeping yourself calm.