I've done quite a bit of the plastering in my house… mostly self taught, with a few tips from a pro who did my living room (walls were massive and way beyond me at the time!).
I played around with various polyfilla and one-coat stuff before I discovered that the pros use the proper stuff for a reason; it is MUCH better!
If you are plastering a section of brickwork which needs to be deep, use proper bonding plaster – it is lovely stuff, nice and thick and really sticky. The skill is in getting it off the hawk and on to the wall, without dropping it. After that, you just need to wait for it it go off a bit, then polish it up and scratch it ready for your skim coat.
Finishing plaster is also great stuff, as long as you are confident and work steadily through a well mixed batch of plaster. Get it quite wet and keep going to get it on the wall… If you are doing a fairly small area, get it on and level, then have a cup of tea. After the brew, come back and polish it with your trowel and a spray bottle of water.
Get stuck in and learn, but leave the one coat plaster and the expensive kits to the bodge artists. A 25kg bag of plaster will cost you about £6. Buy yourself a comfy hawk (the thing you hold your working plaster on) and a reasonable metal trowel – about 20 or 30 quid should get you both of these. Oh, and buy a big rubber bucket to mix your plaster in, and a paddle attachment for a drill. Nothing expensive needed, just lots of patience and someone to help you who doesn't mind you shouting and getting angry at inanimate objects 🙂
I'm now reasonable enough for people to ask me to do bits of plastering for them. I did my brother's hall last month and he was very happy with it – aided by the fact that it only cost him a curry and some beers.
Dave