For a newcomer the skills you'll be needing to pick up are to do with dexterity in handling small parts with tweezers, undoing screws and making sure the screwdriver blade doesn't slip, cleaning parts, reassembly, putting the balance back in place etc. etc.
You don't want to be starting out with expensive movements and so pin-lever designs (like the Ronda 1113) are ideal as they'll introduce you to the makeup of a watch and allow you to practice the above skills and can be picked up pretty inexpensively.
Initially I'd advise getting hold of a working movement. This way you can concentrate on the important dexterity skills and disassembling and reassembling with the aim of the watch still working afterwards! The danger with picking up a non-working movement - especially on cheaper movements with limited shock protection and jewel counts - is that the balance staff can be shot or parts worn which then means you have to get other movements the same for spares or new parts which outweigh the value of the movement.
So in summary I'd say the actual movement you chose is less important than getting something that works already and/or where there is good availability of other 'spares or repairs' movements the same so if something goes wrong you have a parts backup source.
Old movement probably been sitting idle for long time, I soak the movement in naphta for a day or two or apply penetrating oil which reduces risk of breaking screws . Take extra care with pin pallets. Not worth buying parts for, I got some parts to it.
Whatever method is used to remove a staff it is imperative not to distort the balance or elongate the hole. The most trusted method used for many years was to remove part or all of the staff on a watchmakers lathe. However there are other methods which involve pushing the old staff out either with a Platax tool or a staking set. These methods can be problematic especially with vintage watches as the metal used was very hard. Also when using this method you must support the cross section of the balance to eradicate any distortion. There is a tool that can be purchased for this for staking sets.
Personally I remove part of the staff on my lathe and then push it out to eliminate any mishaps.
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