osjohnm;
I too, have never worked with any conversion kits or resin parts before, but in the last two weeks, I have ordered
three cobracompany update kits!! If you are looking to give your kit a more realistic and accurate look, then get a resin update by all means. Just go slow, and measure twice, cut once!
Just beware of sanding or sawing resin....it gives off a very fibrous and hazardous dust -- so wear a mask. Also, if you have a battery-operated motor tool, cutting out those parts will be 10 times easier.
What cobracompany kits are you looking at? I just received the AH-1W NTS update, UH-1N fleet upgrade, and UH-1N weapons set, all 1/35th. All very good.