With my first pg I decided to switch to a HB 3 weeks before my due date... it was sooooooo worth it. My labor went so fast there's no way anyone could have gotten me into a car
Which is funny because the reason I chose HB, for the most part, was because I was scared of laboring in the car... must have been instinct. We DID barely get the tub filled. My doula was running back and forth from the kitchen with pans of water she'd heated on the stove. But I will say this, my opinion of course, I would never puropsly birth without a tub, and I would never use a blow up. Aqua doulas are the best. With a blow up you cannot control the temperature of the water and women are often disturbed by water being addedd and making "swirls" of different temperatures. Not to mention, if you don't have someone to tend to the water temp your dh will have to do it and you will not want him to leave you for a second. If you do have someone, like a doula, it will distract them from the job they are there to do. A lot of doulas I know will not attend a birth with a blow up tub. Because of that, most of the ones in my area have aqua doulas that they rent out, but the tub is included with the doula fee. That's what I did. I also would never purpously labor without a doula, regaurdless of where I was birthing. I was so thankful that my husband was able to pay complete attention to me, and yet all of my needs were met. My doula seriously did not rest for a second the whole time, I got my moneys worth!
I really wasn't prepared for home birth, this time I'm WAY prepared! Here is my 2 cents: Make sure you have fresh fruit in the house and a LARGE cup with a straw. Get extra Chux pads. Make sure you've got a good supply of postpartum recovery products (Earth Mama Angel Baby has a PP kit that is awesome). Even if you plan to labor and birth in the tub, put some sort of plastic cover on the bed. Prepare to have someone help clean your house a few days after birth, it will be upside down! Have LOTS of pillows. Have the tub in your house, fully assembled and ready to fill by 37 weeks. You might want to make a sign for your front door that says something to the effect of "homebirth in process, do not disturb". Make sure you've got all of your HB supplies by the tub by 37 weeks, your mw should give you a list of supplies you will need if she hasn't already. You will also need a table of some sort near by for the mw to lay out her supplies. And, of course, precook at least 2 weeks worth of meals and freeze them, but that applies to any birth.
Best of luck! Homebirth is awesome. You might also want to plan your lighting (dim and coming from the sides of the room) and choose some relaxing music to play during labor, keep it in the CD player so all you'll have to do is hit play.