My advice is:
1) you tube - plenty on there
2) get a book on it - I got one from Amazon
these give you the basics
3) Find a wg who likes bids (rec) and discuss it with them
4) when you have found a suitable victim then try it.
It isn't easy, but it does get easier and quicker.
I have tied up, probably 6 WGs. I have also done 2 suspensions. I love it!
Oh! you'll need some rope too! Bay suppliers do it quite cheap.
Best of luck!