The guides for everything I personally feel and found (with the relevant ones I have used) are very easy to use, even for the basic jobs that may need doing.
Personally I have found that usig the guides I have managed to complete jobs that otherwise, I would not have carried out, such as changing the clutch...
The guide for removal of the alternator belt for the TD is invaluable due to the ease of removal of the main pulley, which is completely different to TIS, Vx, BMW (Being the BMW engine) and another way I used...
There is a lot of time put in by those who have written/write the "How To's" and even on a basic job, come in useful, such as being able to see exactly what is involved before undertaking the job at hand, which if you are not a mechanic, gives a clear picture of what you are most likely to see...
I know that without OOF and its Maintenance guides, I would have been forced to part company with my Mig a long time ago, due to the cost of paying someone to do the work for me... Thankfully, purely because OOF exists, with the exception of the clutch, I have been able to get relaveant assistance diagnosing and correcting faults without having to replace any parts, except for a bulb, in over 12 months of motoring... Purely because of the OOF Maintenance guides, I personally saved over 200 quid by being able to replace the clutch myself...
I won't say that my Mig runs or handles perfectly as I know that some things are in desparate need of replacement, but, they are purely down to my current lack of work situation, again these jobs I know will be done with the assistance of the guides...