Sorry if I am repeating what somebody else already wrote but I skipped a few pages in this thread, reading through all the trolling accusations would simply take forever.
The logistics of doping, especially during the GT's:
Epo gets injected subcutaneously and can be done by the rider himself. He basically just need to collect from his "pusher" and take the stuff.
Testosterone is usually applied as a cream or patch, again, very easy for the rider to administer by himself.
The blood transfusion is the tricky part.
First of all there is the issue with handling and identification. You don't want to infuse somebody else's blood. Anaphylactic or allergic reactions can occur as it did with Marzano. Even worse, you could fail a test for homologous blood doping.
Next, the rider usually does not have the skills to insert the IV by himself. Having inserted a few thousand IV-lines myself, I can say, that it takes some training. There is a learning curve of approximately 30-40 IVs for a paramedic/nurse/med student, before they get it right in the easy to average case.
Then add the limit amount of veins available for puncture (you can't really the arms/hands, needle marks are bad for business) and the less than optimal working conditions of a hotel room.
Luckily, GT riders are skinny fellows, so it will usually be possible to insert the IV in the foot. If not, then you're bound for an abdominal vein or the upper thigh. As a last resort, a vein on the arms can be used but you risk haematomas if you're not careful when inserting the needle or you risk subcutaneous extravasation of the blood. In either case you leave some nasty tell-tale marks, which are hard to cover up the next day.
Then you need to be comfy with the infusion itself, getting the lines connected etc. etc.
All this needs to be done in a hurry and in a stressful environment.
So delivery of the blood doping during i.e. the Tour requires not only getting the blood bag from the clinic to the hotel without heating it. It also requires skilled personnel to infuse the the stuff in a hurry under suboptimal conditions.