well it may happen.... however if you are doing it the way you describe it above you violate the number one modelers rule: "never work on your models in a hurry!". if you are making mistakes (wrong wiring, bad soldering, confuse something etc) you mostly do it because you are in a hurry. i learned that the hard way. as it is a hobby and not a job you should always be relaxed working on your cars. in the end you are even faster and make fewer mistakes. i try to follow this rule more the older i get. e.g. i skip this 3 am in the morning testing-thing etc. you can be sure you mess up something doing it.
just my 2 cents.
rhylsadar