Apologies for disappearing act - amazing how scatty you become, be warned! 
RP sounds like you've done your research! Firstly, a warning that I belong to the slightly more lentil-weavy section of obstetric society so this comes from a slightly alternative viewpoint. Is there any reason that your pregnancy would be considered high risk? (Mine is and I'm still hoping for a HB so if it is it's not the end of the story...) if not I would imagine they'll be happy for you to have a HB. Advantage is that HB obviously lessens the chances of intervention and you avoid hospital (I also hate hospitals, weird given I work in one) - however the NHS tend to have a fairly low tolerance for transfer. When you speak to the HB team I would probably ask if you could have a meeting with a supervisor of midwives/consultant at your local hospital, so that you can put a plan in place re: avoiding instrumental delivery prior to turning up in labour, when with the best will in the world it's not always possible to read your notes thoroughly. Given your history I think most reasonable SOMS/docs would agree to go to section over and above risking traumatising their patient. Obviously you have the right to decline any intervention but the last thing you want is to have an argument on your hands while you're in labour. You also need to discuss the possibility of instrumental delivery being the best option in some situations and what could be done to make it bearable for you in that eventuality, although obviously it's a rare occurance that it's unavoidable - but best to be prepared.
On a slightly separate note, as I said you have the right to refuse any intervention. That includes vaginal examinations to assess progress if you don't want them (I will be declining unless my midwife feels there's a genuine problem). Remember that birth does not run on a schedule, much though some would like to think it does, so if you're not comfortable with internal exams you can say no. Always ask people to explain why they feel it would be necessary, there often isn't a reason other than 4-hourly examination protocols which are a load of crap. Similarly breaking your waters is generally unnecessary and doesn't particularly shorten the length of your labour (by about 20mins on average I think, going on relatively recent research which I may be able to find somewhere) but can make your labour harder.
Sutures are another point, I'm not sure how you feel about that - again, perhaps read up on the evidence behind stitching vs leaving to heal in the case of 1st and some 2nd degree tears and have a chat with the HB team about it - also find out if they all suture as in our trust some HB team don't (barmy) so if you need stitches you then have to transfer in. A bad tear would need stitching in theatre - worth looking up perineal massage perhaps if you haven't already, the evidence isn't particularly compelling but it's worth a go!
Hypnobirthing is a brilliant idea, I'm also looking into it for this time round and have seen it used really effectively at work. Again, make sure the homebirth midwives are on board wih this although I would imagine they're used to it, but it's nice to have someone who's respectful of what you're doing and doesn't interrupt or distract you.
Sorry if this is a bit waffly, having a night of random wakeups so I'm a bit beyond making sense! Did that help at all or have I totally missed the point?
Xxx