Link Building by Guest Posting.... But How many posts?

[technotech]

Hello

I am a small Computer/Tech Blogger (part time) from India and following are my Domain stats:

• PR: 4

• Alexa Rank: 65K

*** Open Site Explorer Page Authority: 46/100**

*** Open Site Explorer Domain Authority: 35/100**

*** Open Site Explorer Linking Root Domain: 98**

*** Open Site Explorer Total Links: 1196**

*** mR: 4.83**

*** mT: 5.81**

• Domain Age: 3 Years and 4 Months

• Blog Posts I made: around 580

I never spent ANY time in Link Building, only wrote content for my blog. I only attached my Blog URL in some BIG forums as a signature (never meant for link building, but later found that the signature section of some forums are DOFOLLOW) and very few sites linked/links to me/my articles.

Reasons why I am asking question here:

• Majority of my blog posts ranks very well (top 10) on Google.co.in, but on Google.com, most of them are present from Page 2 - Page 10 - I want to rank my posts well on Google.com, Google.co.uk etc.

• SERP of Big sites remains static, but my position shuffles a lot. Sometimes any particular blog post of mine is on first page (on a particular Google Domain) and after some days/months, it shifts to 2nd or 3rd page! This happens a lot!

• As soon as Google Updates pagerank, many recent articles of mine will get atleast PageRank 2 or 3, but when pagerank in updated again, the pagerank of these very same articles drops! Very few articles of mine have static pagerank

• I am not a master in Computers/Tech and am not the first one on the internet to discover and write something UNIQUE/NEW, but I try to write detailed and good quality tutorials. If main keywords of my posts matches with the keywords of BIG domains, I never rank on first page, no matter I have written more detailed content compared to the content of these BIG sites! Google sends me traffic to majority of my blog posts by means of  random keywords!

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I have decided to do Guest Posting on some blogs of similar niche and with Open Site Explorer Domain Authority ranging from 60 to 80.

I will try my level best to write good content for them and they also allows Author Bio with a backlink to my Blog Homepage (in my case, the anchor text  for this link will be my Blog Name)

I want to ask following questions:

• Is one guest post with a backlink to my Homepage is enough? or I have to write more content for same domain?

• I have heard that, if you link to a website/blog which is linking to you, Google don't pass any juice to either of them because of reciprocal linking! - Is this true?

The websites on which I am planning to do guest posts are very well established and trusted websites. Some of them have Open Site Explorer Domain Authority of 80+. Also, I never linked to them nor I am planning to do so!

I request SEO Gurus here to please help me and I apologize in advance if I am wrong at any point. MY SEO concepts are not much clear and I am a newbie

Thanks and Regards

[SEODinosaur]

I have been guest posting for a little while now and I can tell you from experience good sites (authoritative ones as listed above) are not easy to guest blog on. You will need to give the author of the website something valuable to his readers. I noticed you are focusing on little details on what Google counts and what they dont. IMO forget all that, give the users something valuable so that they will like your site, mention it, and bookmark it. If users like your site so will Google!