I made like 20 tries, before my Ranger got Legendary Survivor
1st - 6 th attempt: Ranger > Made Survivor > Died in Vizunah Place Mission
(that was horrible, ever in the same Mission)
7th attempt Ranger > Made Survivor R2 > Died in the Forgotten City of Ahdashim
8th attempt Dervish > Made Survivor R2 > Died also in the Forgotten city of Ahdashim
9th attempt Elementalist > none Rank > Died somewhere on Istan through Lag
10th attempt Monk > none Rank > Died somewhere on Shing Jea thx to Lag
11th-13th attempt > Dervish > each R1 > Died in Mission Consolat Harbour, while making a Quest in Vaabi and thx to Lag
14th to last attempt > Ranger > all R2 and last one got finally R3 due to excessive analyzing of my behavior, kinds of moving where and learning out of my mistakes from the other attempts.
14th: died in Mission 9 Elona
15th: died while making a Quest in Kourna
16th: died while farming LB points
17th died in Mission 10 Elona
18th: died thx to a god damn monk player, who forgot to heal/prot me in Vizunah Place
19th: died while farming, cause I underestimated some enemies, with that I have with an other class normally 0 problems
20th: yafter 2 Months of making all missions carefully with no mistakes, playing only with PUG, hunting for Elite-Skills, while the Double Exp Weekend were active and carefuly farming LB points at 1 place with EXP trippling scrolls, i made the R3 finally and got so my real "main Chara"
I never leaved/leeched or so by any attempt, I made everythign only through making Missions/Quests, Farming with Scrolls or E-Skill Hunting(< this especially most, with that i got by far most my points

) and I'm proud of, that I've least 1 character in the moment, with this title.
after I got it, I didnt cared anymore about, if i die now, or not, I started playing normal again, then after further like 75k exp, I died ..proudly XD and was in genera happy, to die again whenever i want XD without a problem
I say only, now more R3's will follow and when I can make a Ranger to R3 with my tactics, I can make now the other classes too with it.
Imo its really only a matter of making experience ..lots of experience first and then you must start to learn about your mistakes, so that you don't do them ever again twice, to reduce really your chances to die only on having lags, what simple means, ur unlucky... and its not your fault then
I think, next R3 I'll try will be now an Elementalist, with Earth Build, once it has Stoneflesh Aura and all these other skills, which massively boost my Def, it should be easy enough to farm with it, like i farmed with my ranger