If you decide to go for rat tail type kit, the most critical part is the open eyed needle.....I'd suggest a T bar type, as the straight barrel ones (think screwdriver with open eye needle instead of a flat/cross bladed end) can be bloody tough to push through a hole in the middle of a chunky knobble block.
2nd bit, a reamer......you can get T bar handles with interchangeable open eye needles and reamer bits, and my nice one had a hollow handle T piece that held both types inside (some fucker on one of my tours nicked it

)
In my bike kit now, I have an old, fairly coarse, round section needle file that I use as a reamer.......that works well...although it's not entirely essential to ream a puncture wound, it does tough up the rubber and make for a better surface both in the hole well and on the inside of the carcass for the rat tail/glue to bind and seal into)
You can get very cost effective kits on ebay, but have a good look........I just had a peruse and found exactly the same rat tail kits in a box but varying in price from 8 quid to fekking 60 quid!
Rather than going straight to ebay though, have a look on Google for tyre repair supplies...you may well find a proper quality reamer/needle combo......then PM me and I'll post you some rat tails ( I bought many hundreds in a big box ages ago to use in Morocco)