You don't need Supernanny or Dr Byron... just put on here what about the issues you are experiencing and chances are someone will be able to give suggestions.
If you use twitter, you can contact me directly on there @nannynick... and you will find that other childcarers (call us Supernannies if you wish
) are on there as well.
If you really want to spend money, then you could call Ask Nanny but they may not give you any better advice than I (and others) would give you (on here, via PM, or via Twitter) for free.
As lisad123 says, there are courses which can help... such as Parenting Puzzle.
NetMums has an introductory online course, which would lead on to the full Parenting Puzzle course.
Parenting Puzzle: Top Tips (pdf)
Some pointers from me (so based on my experience caring for children over the past 20+ years):
Pick battles carefully - consider how important something really is.
Give praise, give instant rewards (stickers can be good).
Cuddle, Hug - they may be bigger now but sometimes they just want a cuddle. If they are starting a tantrum, a cuddle can sometimes defuse it.
Reward charts... use if it works for your child. Personally I've not found that they work, perhaps I've not cared for the right children yet.
Count slowly to 3... before you act, take a deap breath and count outloud slowly to three. It can give you time to think.