I wouldn't worry about doing a practice day my self ... you are better off doing a sprint with Me , steve , and a few other mini's...
The main reason is at a practice day you will be on the track with cars ranging from 1 minute 14 to cars doing 1 minute 50 ... alot a pro race drivers use practice days to test there race cars ..
At a sprint all the cars are grouped into cars of the same speed .. so you wont get a full blown race car passing you on the outside coming into the northern hair pin..Which is what was happening a few years Back when the boys had Battle day... it is alot more controlled in the sprint with a briefing for first time drivers to the track and there will always be someone faster in front and someone slower behind, .. Ambulance and firies on hand incase the worst will happen.. Plus there are people there to help with your car and give you driving hints..
It is also cheaper to run a sprint ($75) as compared to $100.. But you will have to join the msca which is $20 for the year
For the practice day you will need a a car thats not leaking oil everywhere and your Battery tied down ...
The sprint you need that plus a few extras ... A battery triangle .. Current fire extiguisher a oil catch can ( oil bottle) Two litre capacity ... and secondary bonnet catch (very easy).. A secondary throttle return spring ..
and contact over your headlights... Seems like a lot but it only takes a few hours to prepare a car ..
Hope this helps mate it's a bag of fun and very adictive

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I am the son of the STIG
HOTBRICKS
http://hotbricks.org.au/
'65 NCF MINI.....
'69 MINIMATIC.... 9 year resto still on the go