Fast 800 before intermittent fasting or at the same time?

[JerichosPenisInADeadChickHat]

I'm starting this today and have a couple of stone to lose (currently 12.5 stone).

My plan was to do fast 800 for 10-14 days and then intermittent fasting. Have I got that right?

So - 10-14 days of eating only 800 calories per day and then switch to ?? number of calories only to be eaten between the hours of 12/8pm.

I'm taking a multivitamin and vitamin D as per usual and drinking black coffee and water.

Any tips? Thanks

I have done them both together, 800 calories in a 4 hour period usually. I find it easier than spreading the 800 calories out.