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Yes, I love my clients to tell me how small and insignificant the problem is only to discover it's rotten as a peach. Budget a fair bit for repair care and let the client know up front. One guy I put on to it always charges for 2 sets, so around £120 on any job he's using it. He's not got time for splicing wood though. I don't use anything like that but you could reckon 1 entire set for most of those kind of door jobs if you don't judge it right when you are cutting out with the chisel.
There's a trade off between speed and saving material though. I wouldn't sand it too much once it's dry, use a plane. If you need a really fine finish you'll usually have to fill in some small imperfections with a finishing filler. They make one which does a good job but I've not seen any problem from using a wood filler like the brown pot of wood filler from Toupret.
Yes, there's only one competitor in the market and it's a little cheaper and a little bit less good. Timbabuild is the alt.
You should watch as much tuition about it as possible. The extra tools like a die grinder, ir stripper and flappy wheel sander are helpful tools to have but not essential.
Sometimes with a threshold it's easier to cut the old one out and use repair care to splice a new one in. Its not always necessary but you should decide how much rot you are dealing with early on and cut it right out by the quickest method. Allow about 3mm around the joints and you can add big chunks of wood leaving them to be planed off when it's dry.
Its helpful to use perspex as a mould in some cases. It just peels off the repair care once it's dry. If you use the perspex, plan the sizes before you get mixing the repair care.
Plan to use a lot of everbuild wipes. The repair care sticks to everything and you need a lot of wipes to stop sticky finger spreading everywhere around the house.